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this is a little more complicated than most think, so here is a short lesson on automotive electronics.
electricity flows negative to positive. not the other way around that most people think. the ground or - is what supplies power, it returns through the + or positive red wire per say.
now obtain a wiring diagram. the circuit however complicated is simple by understanding how it functions. direct current flows out negative side of battery to chassis to supply all grounds with power. from grounds it travels through the object of resistance or load. like a light bulb or wiper motor, etc. then travels through a fuse or relay then back to battery.
start at the source of your problem. the load that is not working or where the short appears to affect the system. test the positive wire to the load with a volt meter using a good ground. if good, then reverse, and check the ground wire with meter using a good positive line like the red terminal on the battery.
whatever side - or + shows improper signs of connection trace the line or wire further back till you get a proper signal.
its simple by theory, not always that easy in practice. have patience most importantly.
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∙ 14y ago
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