HELP ! — I need to revive this thread because my problem is still not solved. There apparently is an intermittent SHORT somewhere in the electrical system that keeps blowing the 20A fuse labeled PARK LPS.
As previously noted, the owner's manual says that the circuits protected are: Horn Relay, Horn Feed, Cigar Lighter, Park Lamps. As an update, I have noticed that both front and back parking lamps fail when the fuse blows, not just the tail lights. And the Radio lights also fail. I've also noticed that the dimmer control for the dash lights fails when the fuse is blown, which leaves the clock and heater lights on at full brightness.
After replacing the fuse, I drove for about half a block distance out our alley. There are some potholes at the exit of the alley. When I went through a couple and the truck was jerked around the fuse immediately blew. I replaced the fuse and tried to find the location of the short, but couldn't actually see any likely bad spots or signs of sparking. I drove out the alley again, through the potholes, with absolutely no problem and drove about three blocks, turned around, and drove back to my front driveway where I turned the lights off and then back on and they still kept working fine. After unloading something from the truck, I restarted it and the lights were still working fine as I drove back around and into the alley — but as soon as I again hit a couple of potholes, the fuse immediately blew.
I searched more and, remembering the electrical stuff in the doors for the locks and power windows, I thumped against the inside of the driver's door, which caused the fuse to blow after quite a bit of thumping, which made me think that the short must be inside the door. So, I pulled the panel off and examined every bit of wiring in there, wiggling it all around in various ways, operated the lock and window controls, but nothing I did caused the fuse to blow, nor could I see any problem that would cause a short or any evidence of sparking. I put it all back together, started the truck, and just before I had a chance to shift and start driving, the fuse blew again.
I've checked over everything I can think of – short of electrical wiring and connections inside the steering column housing (which I have wiggled and jiggled plus worked the multi-switch lever, all without blowing the fuse) – and still have not found a short anywhere, under the hood, under/behind the dash, at the parking lamps. What should I do next?
