Quote Originally Posted by xintersecty View Post
2 pins are the signals, the other is ground and dimmer light.
Electrical hacking 101
1) turn on car
2) measure voltage of each wire to ground, record the color and voltage
3) turn on the lights and repeat each step, this should find the lighting circuit.
4) turn off the lights
5) if the wire measures zero to ground then that might be ground
6) if the wire measures a positive voltage to ground that could be the signal.

Do you have a wiring schematic?
Unfortunately I don't have a wiring schematic..

Maybe I could find one in the forum.

How do I ground a cable to measure it's voltage?

I'm sorry for asking so much but I'm very new to this