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M22_COBRA
04-04-2025, 07:15 PM
I'm a bit confused on using the 5to4 converter and the wiring diagrams.
What I Don't understand is... the purple lines become the tan lines post splice, and the tan lines and the black ground power the brake lights. So if I press the brake pedal the the brake lights go on or / Light switch is thrown they have on and bright for stop.

Those same wires off the RR power the rear tail licence plate light. ?? How does the licence light not go on when you hit the brake?

My end goal is to put extra LEDs in the down leg of the roll bar to give extra brake light, so I'm trying to also put the pigtails in now off the right wires.
Thanks in advance.
212157212158

gbranham
04-04-2025, 07:30 PM
Not sure where you're confused. I wired in the trailer converter per the diagram you referenced, and everything works just fine. Here's my wiring diagram for lighting, if it helps.

Greg

212159

M22_COBRA
04-04-2025, 08:47 PM
Not sure where you're confused. I wired in the trailer converter per the diagram you referenced, and everything works just fine. Here's my wiring diagram for lighting, if it helps.

Greg

212159

I'm confused because the FFR diagram shows the license plate wired in series. Which wires going to the tail lights are signal wires? I'm assuming yellow and white of the harness?

M22_COBRA
04-04-2025, 08:48 PM
And if I wanted extra LEDs tied to brakes would it be the side dependent turn signals and a ground wire?

M22_COBRA
04-04-2025, 08:49 PM
I think I'm slowly starting to understand...?

TXeverydayDad
04-04-2025, 10:00 PM
For your 3rd brake lights in the rollbar(s), could you not just use the already provided purple wire? Splice it to the trailer controller for the tail lights and rear brake lights as described, and tap into the purple wire to your 3rd brake light to ground. It’s the same signal. Should work.

M22_COBRA
04-05-2025, 07:07 AM
For your 3rd brake lights in the rollbar(s), could you not just use the already provided purple wire? Splice it to the trailer controller for the tail lights and rear brake lights as described, and tap into the purple wire to your 3rd brake light to ground. It’s the same signal. Should work.

Yes 100%, this is exactly what I'm thinking. The question is what do I tap the purple into?

Greg's schematic made things a little clearer for me ( Thank you Greg!), but I think I need to tap the black ground with new wires, and take the purple dual wires to the yellow & white to get a power switched signal to match brake lights?

Can I take the new led ground wires and make a new ground on the chassis with a stud vs splicing the harness?

gbranham
04-05-2025, 08:39 AM
Glad the schematic helped. What about tapping the purple wire before it enters the trailer converter, and running that wire, along with a ground, to wherever you plan to put your 3rd brake light?

M22_COBRA
04-05-2025, 10:44 AM
It's not really a brake light, I'm using multiple 6 mm LEDs that can take the 12 volt. They only have a power and ground wire. That's why I'm thinking they go to the black ground and the yellow or white wire for the independent signal. I think that'll work?

TXeverydayDad
04-05-2025, 10:47 AM
I’d splice a leg off the purple wire into the trailer controller behind the dash, and then splice a leg off one of the purple in the rear harness where you want the 3rd brake light. The purple is +12v when brake is applied so ground the brake light LED to the chassis frame at the bottom if the rollbar. Should not have to pull a separate ground wire.

MaxVmo
04-05-2025, 04:20 PM
I ended up doing it under the trunk floor and above the tank using schematics from the Forum. I ended up just concentrating on one light at a time and unpacked the wires from the harness tracing them backwards to where they split and reroute etc. Eventually it makes sense.

M22_COBRA
04-06-2025, 07:18 AM
I’d splice a leg off the purple....The purple is +12v when brake is applied so ground the brake light LED to the chassis.

Ok this makes sense now. I guess it just takes me hearing it the right way, multiple times, and with the right cup of coffee and it clicks.
Thanks everyone.

I'm gonna order up my LEDs and wire them in this way. If I get stuck I'll be back :)