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I checked for grounding issues. I see I have the fuse box itself grounding at the signals, but no ground between the fuse box and the lights around the truck.I now have a broken hazard switch (open to recommendations for replacement) which may or may not be compounding the issue.
Hi a couple of questions before answers, do your stop lights work OK as they are the indicators as well at the rear?
What do you mean by this ^^^^^?? As Chevygold stated, the fuse box should NEVER be grounded!
Are you using LED turn/marker/tail lamp bulbs?
sometimes an overlooked ground is under the left tail light assy. You have to remove it to see what I am talking about. I have a bad ground that would do all kinds of weird things on my 1985