1988 GMC C3500 Rear running lights not working

1988 GMC C3500
200,000 MILES • V8 • 4WD • AUTOMATIC
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The tail lights on the rear bed do not work , I've checked the most common problem causers. the front running lights work, cab clearence lights work, turn signals work, brake lights work, and flashers work. The running lights on my car trailer even work? But nothing on my bed? Please send my mind in the right direction.
Mar 31, 2009 at 7:02 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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