Who i used both a relay and a diode.
I tapped into the reverse circut at the rear lights placed a diode there then wired a relay at my adapter to use a switch the switch will trick the adapter into thinking its in reverse, and when placed in reverse it automatically comes on. The relay i used was a mini relay that was allready wired the colors of the wires were red, black, orange, brown, and yellow
i dont know which posts they go to on the relay but i figured it out using a spare battery setup on my work bench before i installed it in the truck
hope this helps.
you could talk to kodiakz and he will probably give you the correct way to wire it up
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03 Black Lux
03 Custom Chopper
96 Road King
82 Vette
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