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I have an 89 F250 XLT with the 7.3L idi. i have working headlights, front markers and turn signals but no tail lights or driver side brake light. i just put in new bulbs all the way around. dual filament bulbs. help??
Could be the switch, but you need to check for power and look at wiring before jumping to that conclusion. Have you tried turning the lights on and off a few times? Sometimes when a switch is going bad, if you play with it the lights may or may not work.
i just replaced the switch and still nothing. could the trailer lights be shorting out my tail lights? the trailer brake in the cab has a ground wire that isnt connected to anything.
I would check out the connections in back (left side at frame rail) that go to the trailer connector.. If a crappy job was done all sorts of bad things can happen..