General Electrical & Lighting Related TopicsAsk here for electrical, wiring, and lighting info for your rig that could apply to all years
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Brake lights work normal without running lights on but when I turn on the running lights both filaments in the brake light bulb comeon. Also factory cruise control works until running lights are turned on. All bulbs seem fine. There are no alarm systems or trailer wiring boxes on truck. There is trailer wiring spliced into the wires at the back of truck but they seem to be working fine until running lights are turned on.
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