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

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

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 12volt 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

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

Fits:
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

Note:
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.

Item # Price
ALT12V
$329.99

Availability: In stock

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Questions: The rubber grommet around the BAT connection broke. Is there any way I could buy a replacement grommet?
Question By: Job Dooley on May 25 2018 4:13 PM
I'm sure we can fix you up. Give me a call toll free at 888-648-4923. Thanks
Answer By: Willys Jeep Parts Tech on May 26 2018 10:56 AM
Questions: Will this conversion work on f 134 .it doesn't have the generator on it
Question By: Edward Spears on Mar 5 2018 5:16 AM
Yes, it will work for the 4 cylinder overhead engine. Thanks
Answer By: Willys Jeep Parts Tech on Mar 5 2018 5:05 AM
Questions: with the 12 volt alternator conversion kit, do i still need the voltage regulator or do i bypass it
Question By: Gary Rathjen on Feb 11 2018 7:27 AM
You bypass it. Thanks
Answer By: Willys Jeep Parts Tech on Feb 11 2018 12:34 PM
Questions: 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
Question By: Tim Branham on Nov 5 2017 4:47 PM
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.
Answer By: Willys Jeep Parts Tech on Nov 6 2017 5:43 AM
Questions: 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.
Question By: Jim Rauschenbach on Oct 25 2017 3:11 PM
We only have alternators in 12 volt. We can rebuild your original 6 volt generator if you like though.
Answer By: Willys Jeep Parts Tech on Oct 25 2017 9:16 AM
Questions: DO YOU SELL JUST THE HARNESS WITH THE RESISTOR OR JUST THE RESISTOR BY ITSELF?
Question By: DAVE JONES on Oct 19 2017 1:52 PM
We can probably accommodate you. Please call us toll free and I can help you. Ask for Mike M.
Answer By: Willys Jeep Parts Tech on Oct 19 2017 7:02 AM
Questions: 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!
Question By: Eric Allen on Sep 17 2017 9:53 AM
It has a built in regulator. So your coil, applicable gauges, bulbs will need to be changed.
Answer By: Willys Jeep Parts Tech on Sep 18 2017 5:51 AM
Questions: 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
Question By: TIMOTHY THURMAN on Jun 25 2017 9:04 PM
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.
Answer By: Willys Jeep Parts Tech on Jun 26 2017 5:44 AM
Questions: 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
Question By: Jim simone on May 23 2017 11:05 PM
Please call us toll free. We can provide it for you. Thanks!
Answer By: Willys Jeep Parts Tech on May 24 2017 5:40 AM
Questions: 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.
Question By: Richard on Feb 15 2017 1:25 PM
We have not tried to use these kits with this set up. I'm sure it could be modified to work for you though.
Answer By: Willys Jeep Parts Tech on Feb 15 2017 5:45 AM
Questions: 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?
Question By: Travis bruns on Feb 4 2017 10:28 PM
Sure we warranty and can help you troubleshoot as well to see what is going on. Thanks!
Answer By: Willys Jeep Parts Tech on Feb 6 2017 5:50 AM
Questions: 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
Question By: Myrt on Feb 3 2017 3:06 AM
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.
Answer By: Willys Jeep Parts Tech on Feb 3 2017 5:40 AM
Questions: 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.
Question By: Harsh on Jan 3 2017 4:48 PM
Please call me toll free and we can help.
Answer By: Willys Jeep Parts Tech on Jan 3 2017 8:49 AM
Questions: 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?
Question By: Ken on Nov 17 2016 2:15 AM
We include a voltmeter in the kit to prevent overloading the existing ammeter. Thanks!
Answer By: Willys Jeep Parts Tech on Nov 17 2016 8:02 AM
Questions: 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???
Question By: Kelly Davis on Oct 16 2016 12:08 PM
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.
Answer By: Willys Jeep Parts Tech on Oct 17 2016 5:55 AM
Questions: 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
Question By: Chad E. Reid on Jun 16 2016 11:50 PM
A fuse is optional but I would recommend it. Please see part numbers: ALT12V and 923068 part numbers install instructions will help.
Answer By: Willys Jeep Parts Tech on Jun 20 2016 5:43 AM
Questions: Using this conversion kit, does it require a different belt length or does the original length work?
Question By: Ron Creech on Jun 16 2016 2:52 PM
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.
Answer By: Willys Jeep Parts Tech on Jun 16 2016 9:32 AM
Questions: I have a 51 pickup and would like to convert it to 12 volt. Is there a kit for everything?
Question By: Brad Pearson on May 28 2015 12:00 AM
We can build it for you. Please call us toll free. We are happy to help out.
Answer By: Willys Tech on May 28 2015 12:00 AM
Questions: 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?
Question By: Dennis on May 12 2015 12:00 AM
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.
Answer By: Willys Tech on May 12 2015 12:00 AM
Questions: I have a 59 willies wagon 3.7 l is this the correct kit to change it to 12v
Question By: Nate on Apr 22 2015 12:00 AM
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.
Answer By: Willys Tech on Apr 23 2015 12:00 AM
That would be 3.7 litre is a 6-226....probably.
Answer By: Dave Underwood on Mar 25 2017 7:07 PM
Questions: Does the pulley on this alternator except the wide fan belt usually used on CJ-2A jeep with a flat head, 134 engine?
Question By: George Philllips on Apr 21 2015 12:00 AM
Yes, that is correct. It is set up for the proper belt.
Answer By: Willys Tech on Apr 21 2015 12:00 AM
Questions: Can I buy just the alternator? or what is the part number on the alternator?
Question By: Anonymous on Mar 8 2015 12:00 AM
Sorry these are only sold as a kit. You'll need our bracket kit to install anyways.
Answer By: Willys Tech on Mar 9 2015 12:00 AM
Questions: Does this come with all required hardware to install? Or do I need to order the generator bolts and rubber bushings as well?
Question By: Anonymous on Dec 27 2014 12:00 AM
Yes you will need to have or get the generator support bolt/bushings too.
Answer By: Willys Tech on Dec 29 2014 12:00 AM
Questions: I have a 1951 Jeep Truck, wondering if it takes a 6V or 12V Battery?
Question By: Mike on Dec 5 2014 12:00 AM
In 1951 it would originally be 6 volt.
Answer By: Willys Tech on Dec 5 2014 12:00 AM
Questions: I broke the cable that resistor is on. Is it possible to get a replacement cable or a new resistor?
Question By: Anonymous on Nov 17 2014 12:00 AM
We can hopefully help. Please call us toll free.
Answer By: Willys Tech on Nov 17 2014 12:00 AM
Questions: Could I get a double groove pulley to fit this alternator
Question By: Anonymous on Nov 8 2014 12:00 AM
Sorry, they only come in the proper single groove.
Answer By: Willys Tech on Nov 10 2014 12:00 AM
Questions: I need to know how the top of the altinator mounts.
Question By: Sheldon on Oct 8 2014 12:00 AM
It mounds to your original bracket bolted to the engine.
Answer By: Willys Tech on Oct 8 2014 12:00 AM
Questions: 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
Question By: Bill on Sep 18 2014 12:00 AM
Yes, the ALT12V kits will fit the 4-134 L & F engines.
Answer By: Willys Tech on Sep 19 2014 12:00 AM
Questions: Will this kit work on a 1970 CJ5 with a Buick 225?
Question By: Andrew on Sep 5 2014 12:00 AM
Sorry this is for the 4-134 and 6-226 engines.
Answer By: Willys Tech on Sep 5 2014 12:00 AM
Questions: Is this alternator have a built in regulator- do I not need a regulator with this alternator
Question By: Alberto on Aug 6 2014 12:00 AM
It is built in.
Answer By: Willys Tech on Aug 6 2014 12:00 AM
Questions: What size is the pulley on this alternator?
Question By: Will on Jun 11 2014 12:00 AM
It is a 3 pulley and has the proper groove for the fan belt.
Answer By: Willys Tech on Jun 11 2014 12:00 AM
Questions: 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?
Question By: Don on Apr 1 2014 12:00 AM
Your alternator is probably bad. I would have it tested or we do sell new ones above.
Answer By: Willys Tech on Apr 1 2014 12:00 AM
Questions: 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?
Question By: Nick on Mar 17 2014 12:00 AM
Sounds like you may not have the lower rubber mounts installed. Part number: A1395
Answer By: Willys Tech on Mar 17 2014 12:00 AM
Questions: 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?
Question By: JJ on Aug 17 2013 12:00 AM
These have a built in regulator so you are all set.
Answer By: Willys Tech on Aug 18 2013 12:00 AM
Questions: 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.
Question By: John on Aug 4 2013 12:00 AM
Please call us toll free. We can go over the wiring and help you answer any questions.
Answer By: Willys Tech on Aug 5 2013 12:00 AM
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?
Question By: Johnny on Aug 1 2013 12:00 AM
I certainly could be. I would check your battery as well.
Answer By: Willys Tech on Aug 1 2013 12:00 AM
Questions: 6 to 12 volt will need a starter to
Question By: Anonymous on Jul 5 2013 12:00 AM
We can help. Thanks!
Answer By: Willys Tech on Jul 8 2013 12:00 AM
Questions: I purchased the alternator kit and it says it comes with a voltage gage that I can replace the amp meter gage.
Question By: Kevin on Jun 21 2013 12:00 AM
Yes these do come with the gauge. Please call us toll free and we can help you out with any questions.
Answer By: Willys Tech on Jun 24 2013 12:00 AM
Questions: I would like to order the Alternator kit, does it include the belt adjustment bracket, my 49 CJ3A doesn't have one.
Question By: kevin on Jun 11 2013 12:00 AM
The upper adjusting brackets are only available used but we can help. Please call us toll free.
Answer By: Willys Tech on Jun 11 2013 12:00 AM
Questions: Your Illustration does not show the voltage regulator is this an internal regulator. do I have to order the regulator separately. Belt size? Thanks.
Question By: scott on Jun 4 2013 12:00 AM
It is an internal regualtor so you are all set.
Answer By: Willys Tech on Jun 4 2013 12:00 AM
Questions: 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.
Question By: sean page on Apr 30 2013 12:00 AM
Sorry, the alternators only come in 12volt. We can rebuild your original generator for you if you like.
Answer By: Willys Tech on May 1 2013 12:00 AM
Questions: 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.
Question By: Wayne on Apr 1 2013 12:00 AM
Yes that is correct. It is built in. The distributor does not need a vacuum advance.
Answer By: Willys Tech on Apr 2 2013 12:00 AM
Questions: 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?
Question By: Anonymous on Mar 5 2013 12:00 AM
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.
Answer By: Willys Tech on Mar 6 2013 12:00 AM
Questions: 1961 Willys FC-170 12 volt system - just a matter of changing the old generator for your new system? Just a bolt-in job?
Question By: Eric on Oct 15 2012 12:00 AM
Yes that is correct. It comes with all the mounting brackets too.
Answer By: Willys Tech on Oct 16 2012 12:00 AM
Questions: 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
Question By: pat parker on Aug 9 2012 12:00 AM
Yes it is built in
Answer By: Willys Tech on Aug 9 2012 12:00 AM
Questions: 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.
Question By: Anonymous on Jun 15 2012 12:00 AM
It comes with it built in. You are all set.
Answer By: Willys Tech on Jun 18 2012 12:00 AM
Questions: Do you sell just the alternator.
Question By: ron on May 21 2012 12:00 AM
We can. Please call us toll free.
Answer By: Willys Tech on May 21 2012 12:00 AM
Questions: Do you have a 12volt heater blower motor??.....im changing my jeep to 12 volt what can i do about the heater blower motor.... thanks
Question By: Anonymous on May 18 2012 12:00 AM
The part number you want to order on our site: HEATER
Answer By: Willys Tech on May 18 2012 12:00 AM
Questions: 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
Question By: Jay on May 17 2012 12:00 AM
You will need to go to 12volt on this. It will burn out.
Answer By: Willys Tech on May 17 2012 12:00 AM
Questions: 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.
Question By: Jay on May 17 2012 12:00 AM
Most of your wiring will be good. You should be good to run those off the alternator.
Answer By: Willys Tech on May 17 2012 12:00 AM
Questions: 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?
Question By: Dan on May 8 2012 12:00 AM
No, it is already built in.
Answer By: Willys Tech on May 8 2012 12:00 AM
Questions: 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.
Question By: Anonymous on Feb 21 2012 12:00 AM
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.
Answer By: Willys Tech on Feb 21 2012 12:00 AM
Questions: does the 12v conversion require different distributor/points configuration?
Question By: Roger on Jan 18 2012 12:00 AM
No your old points syle distributor works just fine on 6 or 12 volt. We also have solid state distributors as well.
Answer By: Willys Tech on Jan 19 2012 12:00 AM
Questions: 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?
Question By: Dan on Jan 7 2012 12:00 AM
Some people replace it some dont. People seem to have a pretty easy time finding the replacement gauge locally.
Answer By: Willys Tech on Jan 9 2012 12:00 AM
Questions: I'm converting a m38a1 to 12v,it has double grooved pulley,does kit come with double grooved pulley and are belts included?
Question By: raymond on Jan 6 2012 12:00 AM
These are for single groove. But I can probably get you a special made one. Please call us toll free.
Answer By: Willys Tech on Jan 9 2012 12:00 AM
Questions: 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
Question By: Pete on Oct 23 2011 12:00 AM
Really just your coil needs to be changed. Its part number: 933160
Answer By: Willys Tech on Oct 24 2011 12:00 AM
Questions: 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?
Question By: Kyle on Oct 7 2011 12:00 AM
A 12 volt coil is the other big thing.
Answer By: Willys Tech on Oct 7 2011 12:00 AM
Questions: Will this conversion fit 1962 pickup with the 226 super hurricane motor?
Question By: Bob Cavanagh on Sep 19 2011 12:00 AM
Yes this is the proper one for you.
Answer By: Willys Tech on Sep 19 2011 12:00 AM
Questions: 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?
Question By: John on May 2 2011 12:00 AM
It comes with it. You should be all set with this kit.
Answer By: Willys Tech on May 3 2011 12:00 AM
Questions: Does this still allow room for the oil filter to mount properly?
Question By: Shane on Apr 22 2011 12:00 AM
Yes there will be plenty of room.
Answer By: Willys Tech on Apr 25 2011 12:00 AM
Questions: Will this alternator work on a Jeep FC-150 w/F-134 engine
Question By: Lynn Thrasher on Mar 13 2011 12:00 AM
Yes, it should work just fine.
Answer By: Willys Tech on Mar 14 2011 12:00 AM
Questions: 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.
Question By: Carlos M Gutierrez Colsa on Feb 3 2011 12:00 AM
We have all the headlights and tail lights available. Please call us toll free.
Answer By: Willys Tech on Feb 4 2011 12:00 AM
Questions: Will the heater blower motor work correctly after changing from 6v to 12v?
Question By: Anonymous on Jan 25 2011 12:00 AM
Yes, that is correct. It is for a 12 volt system.
Answer By: Willys Tech on Jan 26 2011 12:00 AM
Questions: Do you sell 24V alternators?
Question By: Brandon on Jan 25 2011 12:00 AM
I have 24 volt generators available for you. Please call us toll free.
Answer By: Willys Tech on Jan 26 2011 12:00 AM
Questions: Will your M38A1 dash light assembly (A1411-M38) work with a 12 volt electrical system?
Question By: Phil on Nov 30 2010 12:00 AM
Yes, you just need to swap the bulb to 12volt.
Answer By: Willys Tech on Nov 30 2010 12:00 AM
Questions: Is this a one wire alt or does it require a voltage reg? Is so do you guys carry it?
Question By: Dennis on Nov 18 2010 12:00 AM
You just wire it into your existing voltage regulator and battery. It comes with illustrated instructions that are easy to follow.
Answer By: Willys Tech on Nov 18 2010 12:00 AM
Questions: Do you sell just the bracket for the altinator?
Question By: Mike on Nov 12 2010 12:00 AM
I can probably get just that for you. Please call me toll free.
Answer By: Willys Tech on Nov 15 2010 12:00 AM