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Shop Kaiser Willys

New 12 volt Conversion Alternator Kit (4 or 6 cyl)
Fits 41-71 Willys and Jeep

Part # ALT12V

New 12 volt Delco Industrial Alternator Kit

Complete alternator kit to replace your old 6 volt or 12 volt generator on any Willys.

This is a Delco industrial alternator that runs 100-105 amps for great charging. Even has stainless steel slip rings on brushes for long life.

Looking for a Trouble Free Conversion from 6 volt to 12 volt or just want to update your 12 volt system? This even ships out for free

Comes complete with simple illustrated install instructions and all mounting hardware shown.

Helpful Guides and Illustrations:
ALT12V Install Instructions
Bracket Install Instructions
Voltmeter Wiring Instructions

4-134 L engine
4-134 F engine
6-226 engine
6-161 engine

41-45 MB
41-45 GPW
46-49 CJ-2A
49-53 CJ-3A
53-64 CJ-3B
55-71 CJ-5
50-52 M38
52-66 M38A1
48-51 Jeepster
46-64 Truck
46-64 Station Wagon

Uses original upper generator mount.

On some engines you may need to add a spacer on the upper generator support bracket to the block for pulley alignment.

Part # Price





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Will this alternator charge the battery at idle ?

Willys Jeep Parts Tech:
Yes to a point. But the charging is directly tied to the movement of the vehicle (speed)

I have a 1942 MB converted to 12 volts if i use this alternator do i have to purchase a different belt than the one used for the generator? Is there a 12 volt generator available?

Willys Jeep Parts Tech:
Your existing belt will work just fine and line up as well.

When asked, you indicated that the resistance of the yellow wire was 0.5 ohms. The measured resistance of the yellow wire in the kit you sent to me was measured at 500 ohms. Should I be concerned about having the correct resistance in my yellow wire? Thanks.

Willys Jeep Parts Tech:
Please give us a call to discuss.

I am converting my 1955 Jeep Willy to 12v. I already bought this kit and a 12v coil do I also need to replace the starter to 12v as well?

Willys Jeep Parts Tech:
Please give us a call and we can help you.
Willys Jeep Parts Tech:
Your old 6 volt starter will work for awhile but they can burn out if you crank on them too long. It it not a bad idea to go to 12 volt.

What should the resistance be on the yellow wire?

Willys Jeep Parts Tech:
It comes out to about .5 Ohms

I have a 1961 Station Wagon. It does not have a volt meter, but only a light on the speedometer. What should I do? Thanks

Willys Jeep Parts Tech:
Some people will wire in a separate gauge that we provide with the kit.

Does the gauge come in black bezel of our chrome?

Willys Jeep Parts Tech:
Chrome, but could be painted black.

What else do I need to converte 6v to 12v beside this kit? Do I need a 12v starter,coil and distributor also?

Willys Jeep Parts Tech:
There are a few options here. Please call us toll free and we can help out.

Does this alternator eliminate the voltage regulator?

Willys Jeep Parts Tech:
Yes, it has a built in regulator.

46 cj2 changing to 12 volts reading questions here i am confused about what needs to be changed i know the coil changed to 12 what about the starter heater motor lights i assuming that everything needs changed to 12 volts. JR

Willys Jeep Parts Tech:
Its best to change it all over to 12 volt but we do sell reducers as well for your gauges, heater, ect.

If I want to add the sense lead, do you sell the connector or can you tell me what I need to get?

Willys Jeep Parts Tech:
That your local napa would have. We can help too.

I ordered the wiring harness for the generator. However, i have an alternator. Can i Just purchase the writing for the conversion?(instead of buying the whole kit)

Willys Jeep Parts Tech:
Email to help.

I got the alternator installed with bracket, pulleys lined up, but I just happened to be the guy needing a spacer for the upper bracket... any idea where I can find one, or is it something I'll have to fab myself?

Willys Jeep Parts Tech:
You just make one there locally out of some thick washers or cut a piece of tube down. Thanks!

Hi Just wondering how much it will cost to deliver alternator for 57 cj3b 12v to Brisbane QLD Australia

Willys Jeep Parts Tech:
Please email your full shipping address and we can quote you out.

Since the wire for the charging indicator in the instrument cluster comes from the ( A ) terminal on voltage regulator with my generator system, Will the charge indicator still work with your alternator conversion ?

Willys Jeep Parts Tech:
Please email us more information on your vehicle and set up and we can help.

i have a 52 cj3 will i need a 12 volt starter also?

Willys Jeep Parts Tech:
A 6 volt starter with work but eventually if you crank on it too long it may burn out.

I dont have the old generator that was on the engine. can i use the bracket without the generator?

Willys Jeep Parts Tech:
Yes, this kit is designed to work with the original bracket bolted to the engine upper and lower.

Would this kit work on a 230 Tornado engine, or is there a way to modify it to fit?

Willys Jeep Parts Tech:
You may just have to make or modify the bracket to make it work. But it should otherwise.

can i just buy the bracket and price please

Willys Jeep Parts Tech:
Yes, please call us toll free.

Can I just buy the volt meter? I can't seem to find it on web site.

Willys Jeep Parts Tech:
Yes, call us toll free and we can help.

Can I just buy the alternator and the harness?

Willys Jeep Parts Tech:
Please call us toll free and we can help you. Thanks!

Hi! What's the warranty for the Alternator??

Willys Jeep Parts Tech:
We warranty past one year. We never leave customers hanging.

I am using the ammeter connection. I have a line coming out of BAT connector on the alternator through the ammeter and then back to the battery connection of the solenoid. The battery is not getting charged and keeps draining. What is the best way to test the alternator is even charging? Should I, can I hook up the voltmeter in conjunction? Thanks! ~P.

Willys Jeep Parts Tech:
Please email more information on your alternator information and an image of it and we can help you out.

My 46 CJ2A already had an alternator kit when I bought it, but does not have a volt meter. Can you sell the volt meter in this kit separately?

Willys Jeep Parts Tech:
Please please call and we can help you out. Thanks!

I have one of these and the resister was broken during removal of the engine during restoration. What size resistor is this and can I order another one through you?

Willys Jeep Parts Tech:
Please email and we can help out. Thanks!

Dou you sell only the support?

Willys Jeep Parts Tech:
Please call us toll free and we can help.

My '44 has the original generator which need to be replaced. If a proceed with this conversion kit, will i also need to upgrade my 6V coil and battery?

Willys Jeep Parts Tech:
If your going to 12 volt then yes the coil and battery will both need to be 12 volt. This alternator kit has a built in regulator.

I have a 1948 CJ-2A is there any other items I would need to go with this 12 volt alternator conversion Kit?

Willys Jeep Parts Tech:
If your old generator support bolts and bushings are not in good shape i would get those as well.

where can i find a 12 volt starter for 1955 willys 6cvl.

Willys Jeep Parts Tech:
We have them. Please call us toll free. Happy to help out.

I purchased your one wire alternator. my question is, do I use a voltmeter or ammeter?

Willys Jeep Parts Tech:
It comes with a Voltmeter.

Is just the alternator available to purchase?

Willys Jeep Parts Tech:
Sorry, these only come in as a kit.

Which terminal of the ignition switch does the yellow wire from the alternator attach?

Willys Jeep Parts Tech:
The yellow wire going to the ignition switch - to the IGN / as as the coil. Thanks

why the cut out on the side of the hood.

Willys Jeep Parts Tech:
The hood has the hole cut in the hood for the snorkel to come out of. Thanks

I bought this Alternator-kit from you 6 years ago, and I still use it. Do you have a Voltage Electronic Regulator for this Alternator?

Willys Jeep Parts Tech:
The regulator is built into the alternator already. Email and we can try to help.

Do you offer the bracket assembly, bolt and spacer separately?

Willys Jeep Parts Tech:
I'm sure we can help you. Give us a call toll free and we can set you up. Thanks

Does the alternator kit contain a new voltmeter / ammeter? If so then is it properly sized to replace the existing OEM ammeter and does it have the proper coloration of black bezel with black dial face and white numbers / lettering?

Willys Jeep Parts Tech:
Yes, it will have the gauge with it and fit in your original 2" hole. Scroll thru the photos to see it above. Thanks!

The rubber grommet around the BAT connection broke. Is there any way I could buy a replacement grommet?

Willys Jeep Parts Tech:
I'm sure we can fix you up. Give me a call toll free at 888-648-4923. Thanks

Do you sell bracket only

Willys Jeep Parts Tech:
Yes, we can set you up with just the bracket. Give us a call toll free at 888.648.4923. Thanks

Will this conversion work on f 134 .it doesn't have the generator on it

Willys Jeep Parts Tech:
Yes, it will work for the 4 cylinder overhead engine. Thanks

with the 12 volt alternator conversion kit, do i still need the voltage regulator or do i bypass it

Willys Jeep Parts Tech:
You bypass it. Thanks

Would my alternator be draining my brand new 6 volt battery and what do you charge to rebuild a 6 volt alternator? Thanks.

Willys Jeep Parts Tech:
Are you sure you don't have a generator on there that is 6 volt? Call me toll free and we can help you out. Ask for Mike M.

I have a 1942 Willys CJ2a that I would like to change from a 6V to 12 volt system. Do I need to change the sending unit for the fuel tank? Also, do I need to change the old coil? Do you sell these items? Thanks

Willys Jeep Parts Tech:
They didnt make CJ-2A in 1942. Email or call us toll free and we can help you ID your Willys. The sending unit works on resistance so it functions on both 6 and 12 volt. The gauge in the dash will need to be 12 volt.

I want to keep my brand new 6 volt battery and change my alternator because the ampeers guage keeps indicating a discharge. I dont see a 6 volt alternator for sale on your website. I have a 1947 CJ2A. Thanks.

Willys Jeep Parts Tech:
We only have alternators in 12 volt. We can rebuild your original 6 volt generator if you like though.


Willys Jeep Parts Tech:
We can probably accommodate you. Please call us toll free and I can help you. Ask for Mike M.

This is a desirable conversion so I can run a winch. With this conversion, what else do I need to convert? Light bulbs, starter, fuel sending unit, ignition parts? Change the wiring harness is probably advisable since the 6v harness is old but it should handle 12v fine, correct? Please advise what else will need to be converted. Thanks!

Willys Jeep Parts Tech:
It has a built in regulator. So your coil, applicable gauges, bulbs will need to be changed.

My new 12V conversion alternator came with a narrow groove pulley, not compatible with the wider pulley grooves on my 1944 MB... Can you send the proper width pulley? order 100013388, Oct 2016 installation is just now being affected

Willys Jeep Parts Tech:
The pulley provided will work with the wide groove belts without slipping. We can get you a wider pulley if you like but the one provided should be good. Please call us toll free and we can help. You can ask for Mike M.

Just purchased a 48 willys truck that's missing the alternator conversion bracket, it's actually missing one component to properly install. Do you offer a replacement bracket. If so how do i order Jim

Willys Jeep Parts Tech:
Please call us toll free. We can provide it for you. Thanks!

I have a '62 cj6 with a plow. The factory PLO or hydraulic unit that lifts the plow has a bracket that attaches around the generator which secures the unit in place.The hydraulic unit sits on top of the generator. Will your conversion work with my application. Do you sell any conversion kit that will work in my application.

Willys Jeep Parts Tech:
We have not tried to use these kits with this set up. I'm sure it could be modified to work for you though.

I bought this kit and installed it last year. I have only run the jeep for a few hours (maybe 2-4) since and I noticed that my alternator is no longer charging. I checked al fuses/breakers first and then disconnected it from the battery, with the engine running it is producing 0 volts. Do you have a warrantee program?

Willys Jeep Parts Tech:
Sure we warranty and can help you troubleshoot as well to see what is going on. Thanks!

Wanting to chg. my CJ 2A to 12 volt and saw in the notes on your 12 v. Alternator, it says has to be a neg. ground system. Mine is positive ground with 6 volt system. Do I do some switching of cables on starter/solinoid? Thanks

Willys Jeep Parts Tech:
Yes, they originally were a negative ground. If you like we can put you in touch with our electrical guy to walk you thru it as well.

Is it possible to buy just the bracket that holds the alternator as we already have an alternator but need the bracket to mount it.

Willys Jeep Parts Tech:
Please call me toll free and we can help.

The description says this alternator runs at 100 - 105 amps, however the ammeter (even new ones you sell) only go up to 50 amps. Will this over load the ammeter?

Willys Jeep Parts Tech:
We include a voltmeter in the kit to prevent overloading the existing ammeter. Thanks!

This bracket doesn't seem to fit my 57 CJ5. Are there any directions with diagrams of how to attach this thing to the block???

Willys Jeep Parts Tech:
You need to use your original lower bracket that is mounted to you block. Our adjustable bracket is designed to work with that. Please call us toll free and we can help.

I have a 1960 CJ5, and am updating the distributor and ignition switch, and alternator, do i need to install a fuse box?? Do i need to purchase a different wiring harness?? What is the blue wire on the diagram of installing the distributor??? Thanks for your help. Chad

Willys Jeep Parts Tech:
A fuse is optional but I would recommend it. Please see part numbers: ALT12V and 923068 part numbers install instructions will help.

Are these easy to install without special tools, or do i need to order additional parts to secure to seat frame.

Willys Jeep Parts Tech:
No special tools are required. You just need the screws to install which we sell as well part number: HDWRKIT

Using this conversion kit, does it require a different belt length or does the original length work?

Willys Jeep Parts Tech:
Your original belt will work just fine. You do need to reuse your old lower mounting bracket at the block and the shoulder bolts/bushings with our lower bracket.

I have a 51 pickup and would like to convert it to 12 volt. Is there a kit for everything?

Willys Tech:
We can build it for you. Please call us toll free. We are happy to help out.

I see what looks like only the lower mounting bracket. Will this allow the existing upper tension bracket still to be used? Does the lower mounting bracket bolt to the existing generator bracket?

Willys Tech:
Yes, you need to reuse your old upper mount bracket. Your original lower bracket on the block must be reused to with the adjustable one we provide as well. We do sell both brackets as well if yours are missing.

I have a 59 willies wagon 3.7 l is this the correct kit to change it to 12v

Dave Underwood:
That would be 3.7 litre is a 6-226....probably.
Willys Tech:
Not sure what you mean by 3.7 but yes this is the correct alternator kit in 12 volt for either the 4-134 or 6-226 engines.

Does the pulley on this alternator except the wide fan belt usually used on CJ-2A jeep with a flat head, 134 engine?

Willys Tech:
Yes, that is correct. It is set up for the proper belt.

Can I buy just the alternator? or what is the part number on the alternator?

Willys Tech:
Sorry these are only sold as a kit. You'll need our bracket kit to install anyways.

Does this come with all required hardware to install? Or do I need to order the generator bolts and rubber bushings as well?

Willys Tech:
Yes you will need to have or get the generator support bolt/bushings too.

I have a 1951 Jeep Truck, wondering if it takes a 6V or 12V Battery?

Willys Tech:
In 1951 it would originally be 6 volt.

I broke the cable that resistor is on. Is it possible to get a replacement cable or a new resistor?

Willys Tech:
We can hopefully help. Please call us toll free.

Could I get a double groove pulley to fit this alternator

Willys Tech:
Sorry, they only come in the proper single groove.

I need to know how the top of the altinator mounts.

Willys Tech:
It mounds to your original bracket bolted to the engine.

I am looking to change my fc150 to a 12v system. the web site dose not tell me if any of the alternator and bracket will fit

Willys Tech:
Yes, the ALT12V kits will fit the 4-134 L & F engines.

Will this kit work on a 1970 CJ5 with a Buick 225?

Willys Tech:
Sorry this is for the 4-134 and 6-226 engines.

Is this alternator have a built in regulator- do I not need a regulator with this alternator

Willys Tech:
It is built in.

What size is the pulley on this alternator?

Willys Tech:
It is a 3 pulley and has the proper groove for the fan belt.

I have an alternator on my 48 Cj2. If I have trouble keeping a charge in my battery, is this caused by a bad alternator?

Willys Tech:
Your alternator is probably bad. I would have it tested or we do sell new ones above.

I have a 1946 cj2a with the l head engine. My alternator shakes quite a bit while the engine is running. Is this normal? Am I missing some hardware?

Willys Tech:
Sounds like you may not have the lower rubber mounts installed. Part number: A1395

I have received your alternator and the simple instructions. One of your previous answer says it has to be wired into the voltage regulator. HOWEVER, your simple instructions do not show a regulator any where in them. So do you have an different set of SIMPLE instructions which actually show the voltage regulator?

Willys Tech:
These have a built in regulator so you are all set.

What is the blue wire on the diagram for and does it connect directly to the battery without a fuse? The alternator I ordered did not have the blue wire on the plug installed.

Willys Tech:
Please call us toll free. We can go over the wiring and help you answer any questions.

I have a 1950 M38. Which previous owner started 12V conversion on (changed Gen to Alt) . I installed a new 12V coil w/ internally ballast resistor. Can the alternator he put in be the reason why im not getting spark?

Willys Tech:
I certainly could be. I would check your battery as well.

6 to 12 volt will need a starter to

Willys Tech:
We can help. Thanks!

I purchased the alternator kit and it says it comes with a voltage gage that I can replace the amp meter gage.

Willys Tech:
Yes these do come with the gauge. Please call us toll free and we can help you out with any questions.

I would like to order the Alternator kit, does it include the belt adjustment bracket, my 49 CJ3A doesn't have one.

Willys Tech:
The upper adjusting brackets are only available used but we can help. Please call us toll free.

Your Illustration does not show the voltage regulator is this an internal regulator. do I have to order the regulator separately. Belt size? Thanks.

Willys Tech:
It is an internal regualtor so you are all set.

do you carry the regular 6v alternator. I do not want to change over to 12v. I want to keep my 1948 cj2a as original as possible.

Willys Tech:
Sorry, the alternators only come in 12volt. We can rebuild your original generator for you if you like.

Looks great. Does this have a built in voltage regulator? Also if I convert to your solid state distributor does it come with Vacuum advance or does it eliminate the need? Thanks.

Willys Tech:
Yes that is correct. It is built in. The distributor does not need a vacuum advance.

i have 1961 willys cj5, would that be a 6 or 12 volt.and would this work for it? what else would i need to change? how can i tell if the generator that was in it was 6 or 12 volt?

Willys Tech:
If your 1961 you are probably a 12 volt. Just check out the tags on your generator, coil, voltage regulator, bulbs ect and they will tell you.

1961 Willys FC-170 12 volt system - just a matter of changing the old generator for your new system? Just a bolt-in job?

Willys Tech:
Yes that is correct. It comes with all the mounting brackets too.

the alt. kit come with a volt reg. in the alt.or not you have told some people yes and some no so witch is it

Willys Tech:
Yes it is built in

Does this alternator have a built in voltage regulator, or do I need to purchase a separate regulator? The install is for a 46 cj2a, it is currently 12V and uses a alternator from an old Mercedes that is in need of replacement.

Willys Tech:
It comes with it built in. You are all set.

Do you sell just the alternator.

Willys Tech:
We can. Please call us toll free.

Do you have a 12volt heater blower motor?? changing my jeep to 12 volt what can i do about the heater blower motor.... thanks

Willys Tech:
The part number you want to order on our site: HEATER

Do I need to change the old 6 volt harness if I want to convert to 12 volt.?..Also do you supply a stronger alternator other that the one you have. I want to run off road lights and high powered stereo, looking for a 80-90 amp alternator.

Willys Tech:
Most of your wiring will be good. You should be good to run those off the alternator.

When converting from 6 to 12 volt, do I need to change the heater blower motor....cause right now it runs off 6volt...after the change to 12 volt wont it burn out with too much power..?? Thanks Jay

Willys Tech:
You will need to go to 12volt on this. It will burn out.

If I buy this alternator for a 12V conversion in my 55 CJ5 do I also need a 12V voltage regulator or does this do away with the need for a voltage regulator?

Willys Tech:
No, it is already built in.

How does the replacement alternator and starter mate up to a wiring harness? any cutting or terminal conversions necessary? If so, are they included? 1950 Jeepster Fhead(early). really considering both components as I intend on driving this after a frame off retoration. Can the units be painted to match the engine? thanks, Jon.

Willys Tech:
It is a simple chaning of the ends of your wires that exist to plug into the alternator kit. Please see the detailed instructions above. Im sure it could be painted yes.

does the 12v conversion require different distributor/points configuration?

Willys Tech:
No your old points syle distributor works just fine on 6 or 12 volt. We also have solid state distributors as well.

Do you sell a ammeter that will accomidate the new alternator. The ALT12V Install Instructions recommend removing the original ammeter and installing a voltmeter, is that necessary? Do you sell that voltmeter that will work? There are several wires that run through the ammeter do you have wireing instructions for the change?

Willys Tech:
Some people replace it some dont. People seem to have a pretty easy time finding the replacement gauge locally.

I'm converting a m38a1 to 12v,it has double grooved pulley,does kit come with double grooved pulley and are belts included?

Willys Tech:
These are for single groove. But I can probably get you a special made one. Please call us toll free.

Conversion of 57 willys 4 cyl 6volt to 12 what to do with the starter, distribitor, solenoid does require changes ?? or compatible to 12? thank you for the advice

Willys Tech:
Really just your coil needs to be changed. Its part number: 933160

I have a 53 Willys Panel, that is 6 volt. To convert to 12 volt to install a stereo, what other components will I need?

Willys Tech:
A 12 volt coil is the other big thing.

Will this conversion fit 1962 pickup with the 226 super hurricane motor?

Willys Tech:
Yes this is the proper one for you.

I have a '62 CJ-5 with a 12V generator system and want to switch to the alternator. The voltage regulator is the original. Do you suggest getting a new voltage regulator along with the alternator?

Willys Tech:
It comes with it. You should be all set with this kit.

Does this still allow room for the oil filter to mount properly?

Willys Tech:
Yes there will be plenty of room.

Will this alternator work on a Jeep FC-150 w/F-134 engine

Willys Tech:
Yes, it should work just fine.

if change the new alternator 12 volts what can do with the sealed beam headlights 6 volts and tail and stop lights. exits a converter to this. (12 -16 to 6 -8). thank you.

Willys Tech:
We have all the headlights and tail lights available. Please call us toll free.

Do you sell 24V alternators?

Willys Tech:
I have 24 volt generators available for you. Please call us toll free.

Will the heater blower motor work correctly after changing from 6v to 12v?

Willys Tech:
Yes, that is correct. It is for a 12 volt system.

Will your M38A1 dash light assembly (A1411-M38) work with a 12 volt electrical system?

Willys Tech:
Yes, you just need to swap the bulb to 12volt.

Is this a one wire alt or does it require a voltage reg? Is so do you guys carry it?

Willys Tech:
You just wire it into your existing voltage regulator and battery. It comes with illustrated instructions that are easy to follow.

Do you sell just the bracket for the altinator?

Willys Tech:
I can probably get just that for you. Please call me toll free.
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