Originally Posted by Hieneken49
use the relay.
CAN'T BE STRESSED ENOUGH !
If your Wire length is less than 20', you will be ok using 14 gauge wire, which is good to 18 amps of Draw, WHICH if your lights are 100 Watts each, you'd be pulling approx 16 amps total. THAT WOULD BE MINIMUM Wire size, I'd allow more cushion if it were I, and use 12 Gauge, 20 Amp Fused, through the Relay.