Try testing the plug from the truck, if that all works try testing the wire where you connect to the lights to make sure it works. a test light comes in handy for this
Power going to the ground is what is probably shorting everything out right?Originally posted by mh1314
Quite obviously have power going to ground. Wrong wire hooked to ground or skined wire touching ground. If you're using a four-way plug check against these codes and make sure the color continues into the trailer plug and wires.
Good Point.....I forgot to mention that...if the turn signals on the truck are separate from the brake lights (usually amber) you will probably need the converter box Paponte is talking about..Originally posted by paponte
What kind of truck are you working with? I know that with mu UD I was racking my brains out, before I found out I needed a converter box.