Sound like a direct ground, each wire system has it's own color head light, tail lights, turn signal, back up, reverse, best to buy repair Manual for your car and find out what your cars lighting system color are find out what light is blowing your fuse the check those wires for a worn spot or check if a bulb is making contact with metal. if you recently installed big stereo system then problem started see if you nicked wire harness.
best wiring diagram I have found is in a Chilton's manual
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The wiring is shorted ya think?
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