How do I make the 4 lamp high beam feature work?
Included in the kit is a small packet containing relay mounting screws and a black plastic plug that contains a diode. There is also a small diagram showing how to insert this plug. There are basically only two ways to do this. One will get you the results you want and the other will not. The orientation is based on model year and whether the truck is switching on the negative side or the positive side of the circuit. Typically, the late model GM (99-present Silverado/Sierra etc) switch the negative side while the early (90 through 2000 C/K series) switch the positive side.
