How did you wire them? relay? fuseable link? whats your wiring like.
I.E. these are mine.
2 wires from each light, runs into the cab. they are all individually switched. i brought one wire of power from the battery to the switches, split it 4 ways, each wire goes to the switch, in the switch is battery wire, hot wire for light. the switch completes the circuit. all the lights are grounded to the frame. each line that goes out to the light has a 10 amp fuseable link in it.