2021 3rd brake light question

[Dr. K]

Hello,
First official post. Purchased 2021 Ram 1500 Rebel 2 weeks ago and already started with mods. Just installed a light bar that has its own 3rd brake light. Need to find power for it so first thought was OEM brake light. However, 2021 has new LED ; very difficult to remove the OEM since it now has clips top and bottom (4). Finally figured it out but now the LED has 4 wires to it and not sure which is hot lead for brake light. Wires look the same. Anyone have experience with this yet or suggestions? Or should I just make a long run back to tail light which I still think has bulbs.
Thanks for any help.
Ken

 

[piening2150]

Welcome. Tail lights on a Rebel are LED, so no bulbs back there either (but I think the plugs are the same between regular bulb & LED tail lights). I would think one of those wires up there should work, but you'd have to test it with a voltmeter. If you can't figure out which wire to use at the 3rd brake light, you could always tap the trailer plug wiring. Hopefully someone else will chime in with a better idea.

 

[Dr. K]

Welcome. Tail lights on a Rebel are LED, so no bulbs back there either (but I think the plugs are the same between regular bulb & LED tail lights). I would think one of those wires up there should work, but you'd have to test it with a voltmeter. If you can't figure out which wire to use at the 3rd brake light, you could always tap the trailer plug wiring. Hopefully someone else will chime in with a better idea.

Is there a way to test the wires without stripping a piece away?

 

[piening2150]

Is there a way to test the wires without stripping a piece away?

You can stick the VM lead into the back of the plug and test for 12V. Maybe someone's got the wiring diagram or pin layout for the plug.

 

[Dr. K]

Thanks again; forgot about separating the connector and using pins! I was actually quite nervous removing that light and figuring it out I just put it right back. Now I hope I didn’t create the infamous leak problem.

ill send pics when I get it done; really should do a video when I take it apart again.

 

[Rammin BtoS AF]

Is there a way to test the wires without stripping a piece away?

Couldn't you use a toner to check for hot wires?

 

[GunnyJC]

Welcome aboard.