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What are these 4 wires that go to the tailgate brakelight?

steffen707

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I got an Alu-Cab canopy and I want to connect the canopy brake light to this light.

This is under the bed near the rear bumper.
The top wiring plug has 4 wires.
20200527_202945-jpg.jpg



When I checked for continuity to ground I had continuity on the two wires on the right, and the far left green wire. each of them also showed a few milivolts of DC current. I'm no car wiring guy, no idea what this means.

The white with green stripe had 12 volts when the brake was on. So if I can't find a good ground under the bed, I'll probably tap into the black wire for ground and hope it works. I might also inspect the wiring under the tailgate cover to see if maybe i have a better time figuring out which one is truly ground.

20200527_202925-jpg.jpg
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I got an Alu-Cab canopy and I want to connect the canopy brake light to this light.

This is under the bed near the rear bumper.
The top wiring plug has 4 wires.
Jeep Gladiator What are these 4 wires that go to the tailgate brakelight? 20200527_202925-



When I checked for continuity to ground I had continuity on the two wires on the right, and the far left green wire. each of them also showed a few milivolts of DC current. I'm no car wiring guy, no idea what this means.

The white with green stripe had 12 volts when the brake was on. So if I can't find a good ground under the bed, I'll probably tap into the black wire for ground and hope it works. I might also inspect the wiring under the tailgate cover to see if maybe i have a better time figuring out which one is truly ground.

Jeep Gladiator What are these 4 wires that go to the tailgate brakelight? 20200527_202925-
Do you have the trailer wiring in the back bumper? If so, get one of the T harnesses from Curt that connects to the trailer plug behind the bumper. It will give you an easy way to tap into the brake light. That's what I did to wire up my reverse lights.
 
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steffen707

steffen707

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Do you have the trailer wiring in the back bumper? If so, get one of the T harnesses from Curt that connects to the trailer plug behind the bumper. It will give you an easy way to tap into the brake light. That's what I did to wire up my reverse lights.
do you have a part number?
Jeep Gladiator What are these 4 wires that go to the tailgate brakelight? 1590704617949
 

Mr._Bill

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do you have a part number?
1590704617949.png
I ordered the 56584 t harness and the 58540 wiring harness. Made it real easy, and provides a quick disconnect if there's a need. I went five pin to get the reverse line, which is not in the four pin.
 
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steffen707

steffen707

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I ordered the 56584 t harness and the 58540 wiring harness. Made it real easy, and provides a quick disconnect if there's a need. I went five pin to get the reverse line, which is not in the four pin.
wait, you have to plug these into the front of the bumper, or do they plug in behind the bumper?
 

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wait, you have to plug these into the front of the bumper, or do they plug in behind the bumper?
It plugs in behind the bumper. It connects to the back of the trailer connector. The factory harness has a round USCAR plug. Disconnect that, plug the t connector in one side and connect the other end of the t connector to the back of the trailer connector. It's all hidden behind the bumper.
 

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2 wires for brake light 2 wires for lock on tailgate. AS others aid just tap into the trailer plug.
 
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steffen707

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2 wires for brake light 2 wires for lock on tailgate. AS others aid just tap into the trailer plug.
actually the trailer plug wont work. there is no dedicated brake light on my sport S. the left turn is also the brake, and right turn also brake.

so tapping into the tailgate brake light is the best option, just wondering if anybody has access to any kind of schematic to let me know what color wire does what.
 

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steffen707

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Well I wasn't able to determine if black was in fact a ground, but it seems to work. white with green stripe from the tailgate 4 pin plug is positive for brake, no signal for turn signals.

Now my topper has a 4th brake light.

Jeep Gladiator What are these 4 wires that go to the tailgate brakelight? 20200529_140529
 

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Well I wasn't able to determine if black was in fact a ground, but it seems to work. white with green stripe from the tailgate 4 pin plug is positive for brake, no signal for turn signals.

Now my topper has a 4th brake light.

Jeep Gladiator What are these 4 wires that go to the tailgate brakelight? 20200529_140529
I'm adding a 3rd brake like to my bed rack. It's a three wire light so has wiring for park/running lights as well as a brake light. In your solution above, does your light function as a park/running light too or does it only come on with the brakes?
 
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steffen707

steffen707

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I'm adding a 3rd brake like to my bed rack. It's a three wire light so has wiring for park/running lights as well as a brake light. In your solution above, does your light function as a park/running light too or does it only come on with the brakes?
good question. i'll try to check later tonight.
 

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