tail lights do not work. when sput fuse in it sparks. all other lights work on 1990 Chevrolet 1500 Pickup

brake lights, head lights and turn signals work but tail lights will not work

Asked by for the 1990 Chevrolet 1500 Pickup
Faulty switch or broken wire shorted to ground. Does the fuse blow even when lights are off?Check any areas that may have had body repairs and check the wires along bumper/tailgate crossover for damage.
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possibly tail light circuit