we are trying to wire the bow and transom lights and plug in for spotlight in our boat. When we run them directly from the battery they work fine but when we try to run them thru the on off switch the wiring from the battery to the switch gets hot and starts melting.I am using the switch recommended by the dealer and 14 or 16 ga.wire.The dealer said we need to ground each light and the plug but I dont know why we should have to ground them just because of the switch.Also once these are working i will run a inline fuse between the battery and switch.Thanks for any help