My problem was in the trailer hitch wiring. Someone had spliced the wires and the corrosion finally caused one of the wires to crack. I respliced and soldered the wires. All works fine now.
More than likely the circuit board on the taillight housing is bad. Very common. Check for melted plastic or corrosion near terminals on bulb in board. You can buy them at Napa for about twenty bucks per side.
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94 Suburban, same problem....headlights, brake lights, turn signals work, but no tail lights.
I have the same problem I need a solution.
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