What is a plus on a car?

Answer 1

Plus refers to the cars battery. Almost all cars have a negative or minus ground. Since the installers books assume you have knowledge of hookups, they don't go into a lot of detail. SO......plus is the battery plus or (+). this comes from the key when switched on. You CAN get a feed from the plus without a key, but you can run your battery down if you forget to turn the radio off. there is a fuse on the fuse terminal FOR a radio, its almost always switched off by the key, and not shared by other stuff like lights and fans. Upper grade stereos have a yellow or orange wire, a red wire, and a black wire for power. The red wire would go to the key plus, the yellow to plus (memory wire to battery, to remember the radio stations you store), and BLACK to minus (ground) or the cars METAL bodywork. MAKE SURE ITS METAL. Cars have a lot of plastic inside and out, it does NOT conduct electric current, so look for a metal spot or use the same ground the car maker has, usually a lot of black wires on brass colored connectors screwed down in one spot, looks like a deformed spider. One other thing, some shops, Halfords for one, sell plug adaptors. Buy one, it may prevent an expensive wiring error that will smoke the radio.