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I have an 85 E350 6.9 van. I just noticed that when I turn my left turn signal on, the left rear running light goes out. When the turn signal is not on, its fine. A while ago I had wired in for trailer lights. I don't think I noticed this problem at that point...but I guess I'm not sure. Anyone know what could be going on?
p.s. When I say 'running light' i'm referring to the rear lights that stay on all the time when you are driving with the lights on....
i'm only getting back to troubleshooting this after a long hiatus. i replaced the ground that is closest to the lights (the one I had wired in when i put the trailer light connector in). the other grounds near the taillights all seem solid.
i tried undoing the trailer lights. when i try putting the original brown wires together i get no light. when i add in the brown wire from the trailer light hook up i get light again...but still there is no light when i turn the left signal on.
not sure where to be looking next?
p.s. i also tried switching the bulbs as per the other suggestion, but that didn't fix it either...