The rear defroster draws 20 amps and operates at 12 volts . The dedroater itself itself is basically a big resistor. But I suppose it's possible to operate something else on the circuit. Never heard of anyone doing this . Personally think it would be more wise to go with a switch pod system.
You can have 6-10 switches mounted neatly overhead . Everything wired to a fuse panel under the hood so access is easy after initial install.
