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You can use a 12 volt fused source to probe which wire illuminates which bulb.
Just connect ground to ground (black wires in most cases) then using the + wire from the supply, touch the unknown wires.
When the bulb illuminates, attach a label to the wire.
As far as the car you’re working on, if there is no taillight assembly on it at this time, you can find out what wires illuminate what bulb by using a voltmeter or clip on lamp then label those wires.
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How Come Some Drivers On The Street Don’t Know How To Make A Turn In One Direction Without Starting By Turning In The Opposite Direction?
How Come Some Drivers On The Street Don’t Know How To Make A Turn In One Direction Without Starting By Turning In The Opposite Direction?
