I just purchased a 1990 Ford F150 Lariat. The turn signals and hazard lights did not work when I bought it. I figured that it was an easy fix and have no history on the vehicle.
I checked every fuse -- all were fine.
So, I figured that it could be a faulty turn signal flasher.
I replaced the turn signal flasher -- still nothing. Then suddenly I heard a random noise coming from the glovebox area. There, I located a separate hazard flasher. I replaced the flasher with the new one and had the same result with the original -- random flashing.
So, after a few hours of tracing wires and trying different flashers, the rear lights flash but not the front. Still no turn signals. For a few minutes one front light flashed with the two rears. If I turn the turn signal switch it stops the rear hazard on that side.
I have never seen anything like this before. Is this a problematic turn signal switch? If so, how do I replace it? Thank you in advance for your help.