I needed a new tail light for my trailer. The aftermarket tail lights only came with two wires sticking out the back, one red and one black. The stock tail light that broke had 3 wires and so does the harness on the trailer end. People have told me that even though it is different it will work. Do I join the two hot wires together with the red wire and then the return wire to the black? There is no wiring diagram avalible and I dont have the money to replace then entire lighting system. Thanks for your help.
Pull the lens and look at the bulb. If it is a 2 element bulb then it will work, if it is a single element it will not. If it is a 2 element then one of the wires is turn and stop light and the other is tail light. It will use a body ground in that case. On your trailer harness you will have a brown wire, that is tail lights, the turn and stop light (same wire) will be either green or yellow depending on what side of the trailer you are on. The white wire is ground. The turn and stop light will be much brighter than the tail light so just twist the wires together and see which is which. You can hook the white wire to the mounting screw of the light fixture to be sure you have a good ground.
