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Username Post: 3rd brake light on license plate        (Topic#347037)
55LS1 
Member
Posts: 74

Age: 64
Loc: California
Reg: 11-10-05
09-07-17 10:27 PM - Post#2706983    

Having a hard time wiring up my 3rd brake light on my street rod 39 coupe. Can't figure it out have 3 wires running from led 3rd light white, red, black. Any help would be great! Nothing found with a search here, thanks



 




Jim Streib 
Senior Member
Posts: 452
Jim Streib
Loc: Saint Louis
Reg: 03-20-03
09-08-17 09:41 AM - Post#2707024    
    In response to 55LS1

Do you have any idea who made it ?.

Is it something that could be taken apart to see where the wires go or could some pictures of it be posted by you either together or apart to show the internal wiring ?.

Who knows sometimes but maybe the third wire is not even used and one wire would go to the brake switch output and the other to ground.

I've also seen things to where one wire goes to the left brake light bulb, the other to the right brake bulb and then the third wire to ground.

Jim

1968 Chevy II Nova (Garage Find 2013)

https://www.flickr.com/photos/121766713@N04/ albums...

https://www.youtube.com/user/StlNovas/videos

1973 Nova Custom
1974 Nova Spirit Of America


Edited by Jim Streib on 09-08-17 09:41 AM. Reason for edit: No reason given.

 
Jim Streib 
Senior Member
Posts: 452
Jim Streib
Loc: Saint Louis
Reg: 03-20-03
09-08-17 10:19 AM - Post#2707027    
    In response to 55LS1

Just thinking about this some more, the license plate frame does not have a light for the license plate to light it up and then another light for the brake light portion does it ?. This might explain the three wires then with one for connecting to the parking light circuit to light up the license plate, another to the output of the brake switch to light up the brake light bulb portion of the frame, and the third to ground.

Jim

1968 Chevy II Nova (Garage Find 2013)

https://www.flickr.com/photos/121766713@N04/ albums...

https://www.youtube.com/user/StlNovas/videos

1973 Nova Custom
1974 Nova Spirit Of America


 
raycow 
Honored Member
Posts: 27764
raycow
Loc: San Francisco, CA
Reg: 11-26-02
09-08-17 11:20 AM - Post#2707040    
    In response to 55LS1

I vote with Jim. Unless you have a reason to believe otherwise, assume the black wire is ground (-). Try connecting +12V power to each of the other two wires, one at a time, and see what the light does.

Ray

Those who choose an automatic transmission want transportation. Those who choose a manual transmission want to drive.


 




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