Re: Ranger Boat Trailer wiring diagram
If you look at a tail light, both sides will have one wire that is the same on both sides. That's the running lights (dimmer) and that wire will also feed any side or center marker lights. The other wire on each side should be different colors. Those are the brake/turn signal. White will be ground. Electricity doesn't care what color the wires are. Since the wiring (except for color) must still be the same as other flat fours, all you need to do is look at the connector to tell what color is what. If it is still a mystery, break out your battery charger. Hook the negative lead to the ground terminal on the plug and touch the positive clip to any terminal on the plug. Note the wire color and then look to see what light(s) are on.