Reverse Light Wire

[Sauce]

I want to add aux reverse lights with a relay triggered by the oem reverse light signal. It doesn’t appear that feature is specifically fused (tell me if I’m wrong) so since I can’t fusetap the relay im planning to tap the wire directly. Does anyone know the wire color for the reverse light? I should have gotten it when I paid for 24 hour access to the service manuals but I didn’t ?

Also, anyone know if there’s enough fuse capacity to tap a couple amps power from that wire or would I be better off just wiring to the relay and using aux power?

assuming I only need to tap one side.

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[Sauce]

Anyone have the details?

 

[ntbruncie]

If you look down by the hitch on the outer side of it you will see a harness you can tap in there. The harness leading up to the tail lights it’s not going to help you, all the wires are black.

 

[Sauce]

Thanks a lot. Looks like I’ll tap the green / brown wire there.

any idea if it’s fused with enough headroom to tap another 2 amps, or should I just play it safe and tap it to a relay and run power separately?

 

[ntbruncie]

The harness comes straight from the BCM. I would run a relay and power.

 

[ShadowDragon24]

Diode Dynamics C1R pods. using the 2 output 7pin trailer harness I did have to modify the harness. the new universal one they came out with a few years that you could tie one wire into the brake to stop the trailer light error wouldnt work. when ever my I would turn on a turn signal I get that side trailer bulb error because the c1r wasnt flashing, except when my foot was on the brake. the error go away.

so I was getting a cap, and as per the ford body builder guide, I tapped the 3rd brake wire at the bcm, and ran wire to back, tried the brake wire in the plug the provided, still didnt work.

I know these 3rd brake modules for trailers take signal from both turn/brake on a trailer. so I cut the other side brake/turn signal, and attached both wires to the brake wire I ran.

Now the trailer plug powers the marker lights, and the reverse, and the bcm 3rd brake circuit powers the led in the 3rd brake I added. the c1r's, and the cap.

If you however put too much current on the 3rd brake circuit for a cap, etc, you'll need to disable the 3rd brake on the truck. or add in a relay

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