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Shop Kaiser Willys

Brake Light Switch
Fits 46-66 Jeep & Willys

Part # 647801

Replacement Brake Light Switch (for original female terminals)

Original style female terminal brake light switch. Screws directly into front of master cylinder at the outlet bolt.

Fits:
46-49 CJ-2A
49-53 CJ-3A
53-64 CJ-3B
55-66 CJ-5
50-52 M38
52-66 M38A1
46-64 Truck
46-64 Station Wagon
48-51 Jeepster

Part # Price
647801

$17.99

MSRP:

$17.99

MSRP:

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Questions & Answers

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Can I use this switch with 24volts?

Willys Jeep Parts Tech:
No, this is not set up for the connectors from a 24V harness.

Hi, Is this the correct switch for my 1954 Aero Willys sedan on a 6 Volt system? Many thanks, Bry

Willys Jeep Parts Tech:
There isn't a way to confirm that. If you have male terminals on your harness and its the right thread then sure.

When replacing the brake light switch, does any Teflon tape or any thread lock required? Per the parts diagram, I do not see any washers or any type of sealing applicant. Thanks for any help!

Willys Jeep Parts Tech:
I have seen people do this but I do believe it is a pipe thread. Just make sure you are not leaking and if you do use it none gets into the lines.

Hi Mike, Hi Jason, Quick question on my CJ2A; My brake light switch leaks fluid a little bit (couple of drops a week). I'm thinking of tightening up the switch - but it looks original and fragile.... so I'm reluctant to mess with and possibly screw it up. If I give it a 1/8 or 1/4 turn - will it damage the fitting? Or should am I over - thinking this and just need tp replace? Appreciate any advice you might have here. Best regards, Dan

Willys Jeep Parts Tech:
If in doubt replace. And check your copper crush washers at the fitting too.

'48 cj2a. Replacing master cylinder. Would like to test the brake switch. Attempted to test the switch with 100 psi and ohmmeter. Is this sufficient? If so, the switch needs replacing.

Willys Jeep Parts Tech:
This would be the proper one for you.

Your Q&A says "Male Bullet terminals like original. We have them if you need them as well." Can you tell me the order info for the Bullett Connector for BRAKE LIGHT SWITCH FITS 46-66 JEEP & WILLYS Item # 647801

Willys Jeep Parts Tech:
Email mike@kaiserwillys.com to help

1955 CJ5 brake switch....Okay, the little clip that holds the male end in.....Where can I get some? I tried NAPA, he laughed. Please help, thanks.

Willys Jeep Parts Tech:
You would use male bullet connections to slide into the female connections on this brake light switch.

I just put a different axle on the rear and have not hooked up the rear brakes but I have the line blocked off I have my front brakes bled but my brake lights don't work is it because I don't have enough pressure for the pressure switch

Willys Jeep Parts Tech:
I would double check your electrical connections.

Male built terminals for a 1959 cj 5 brake light switch / can’t find them on your web site ‘could u please direct me

Willys Jeep Parts Tech:
647801 is what they originally used on your vehicle. Search for 'brake light switch' on our site and other options will come up too.

MIKE I HAVE A CJ5 AND THE BRAKE LIGHTS STAY ON. DO YOU THINK IT COULD BE THE SWITCH.

Willys Jeep Parts Tech:
946613 sounds like what you need.

What kind of wiring terminals connect to this switch? Does Willys have a specific wiring terminal to use? Regular male bullet terminal ends will fit into the switch but they don’t seem real secure. Thanks for your help.

Willys Jeep Parts Tech:
Male Bullit terminals like original. We have them if you need them as well.

I ordered this switch for my 1952 M38A1 and went to replace it today only to find out my existing switch has male connectors on the switch and female connectors on the wires. Did I order the wrong one or do they sell adaptors to make them work?

Willys Jeep Parts Tech:
804784 is what you need if you still have the original 24 volt set up.

Will this switch work with a 12-volt system?

Willys Tech:
Yes it will work great!

Will this switch work with a 12-volt system?

Willys Tech:
Yes it will work great!

I have the brake switch connected to the master cylinder and my lines are bleed already and wires are connected but my brake light won’t turn on when I push down on the brake pedal , is there something I missed or something that I can do to make them work ?

Willys Jeep Parts Tech:
I would double check you are getting power and a good ground to your switch.

The brake switch for my 47CJ 2A is attached to the floor and visible when the cover plate is removed. It doesn't attach to the master cylinder and appears to operate off the side of the brake pedal. Is this a modification or was another type available? I had the master cylinder replaced and it didn't have the screw in open for the switch. Thanks, Ken

Willys Jeep Parts Tech:
This is the way it should be set up: https://www.kaiserwillys.com/diagram/cj-2a-diagrams/brake-diagrams-willys-cj-2a/brake-master-cylinder-41-71-willys-jeep/brake-master-cylinder-41-71-willys-jeep

Mike i have the dual master cylinder conversion kit. what size is the threaded side of this? i'm thinking we have to put a tee on teh front brake reservoir, install this and re bleed? correct? do you have the TEE size for this switch? thanks,

Willys Jeep Parts Tech:
Into the dual reservoir master cylinders the port thats inboard if installing a tee is 1/2" national fine.

I have purchased this switch and a complete master cylinder assembly. After installing on my 57 CJ5, I noticed a brake fluid leak around threads. I kept tighting to eliminate the leak. All of the threads are used now and it still has a slight leak around the threads. Any ideas?

Willys Jeep Parts Tech:
I would check to make sure it is not on the crush washers where it is leaking. We also have new outlet bolts available as well.

Where do I find the original female connectors?

Willys Jeep Parts Tech:
We sell complete wiring harnesses or honestly your local Napa would have just the wiring ends if that's all you need.

Do you have the switch that is mounted at the brake pedal?

Willys Tech:
There never originally was any switch mounted at the brake pedal.

I just replaced the master cylinder & brake light switch. The male plug in side of my brake light switch is smaller how can I get some larger connectors to fit onto my wiring to fit this switch.

Willys Tech:
This switch is just like original so you had an unoriginal one in there if its any different and you had one of the vehicles listed above. Good news is that is a common NAPA item for the wiring connectors.

I just purchased a new master cylinder from Kaiser Willy for a 1958 Willies Jeep. But the Brake Light Switch I have does not fit (switch fitting is way smaller than whats required for the master cylinder. Does the brake light switch listed above (BRAKE LIGHT SWITCH FITS 46-66 JEEP & WILLYS) mate directly to the master cylinder, or is an adapter required? Thanks. TJJ

Willys Tech:
The master cylinder and brake light switch are both correct. Sounds like you are missing the outlet bolt part number: 637605.

I just purchased a new master cylinder from Kaiser Willy for a 1958 Willies Jeep. But the Brake Light Switch I have does not fit (switch fitting is way smaller than whats required for the master cylinder. Does the brake light switch listed above (BRAKE LIGHT SWITCH FITS 46-66 JEEP & WILLYS) mate directly to the master cylinder, or is an adapter required? Thanks. TJJ

Willys Tech:
The master cylinder and brake light switch are both correct. Sounds like you are missing the outlet bolt part number: 637605.

I've replaced the master cylinder and the brake lights do not function. I'm guessing I installed this switch incorrectly (on the new cylinder without any fluid). What is the correct proceedure?

Willys Tech:
It is a pressure switch so it will need fluid and your brakes bled to work properly.

will the brake fluid leak out when I unscrew the switch to replace it?

Willys Tech:
Yes that is correct. You will need to rebleed the brakes.

will the brake fluid leak out when I unscrew the switch to replace it?

Willys Tech:
Yes that is correct. You will need to rebleed the brakes.

Does the switch come with the little retainer clips to hold the male connector in to the female fitting?

Willys Tech:
The retainer clips are a local NAPA item.

Do you sell the male wire terminals for this and what is the part #.

Willys Tech:
That is a local NAPA item and common. We do sell complete wiring harnesses that are all preterminated.

Do you sell the male wire terminals for this and what is the part #.

Willys Tech:
That is a local NAPA item and common. We do sell complete wiring harnesses that are all preterminated.

will this brake light switch work on a 1953m38a1 with the original 24v system. thanks joe

Willys Tech:
Yes this will be the correct one.

Where can I get a new connector for my brake light switch?

Willys Tech:
This is just simple male terminals. Any local autoparts store will have them.

Where can I get a new connector for my brake light switch?

Willys Tech:
This is just simple male terminals. Any local autoparts store will have them.

what connects to the electrical end of this switch?

Willys Tech:
Your original male terminals.

what connects to the electrical end of this switch?

Willys Tech:
Your original male terminals.
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