i had my old ceramic heater plugged into the cig lighter on my audi, it drew so much current that it blew the fuse so i put a bigger one in & then it melted the wiring on the back LOL, ended up hard wiring it with a toggle switch directly to the battery ha
i would get it wired up properly with relays etc if it going to be drawing a decent amount of current (any decent heater will)
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