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Horn honking, lights flashing
I have a 2000 F250. Recently the horn has started honking and parking lights flashing about twice a second, at random times, for a couple of minutes. The only thing that stops it is inserting the key and turning it to run. I have an aftermarket remote start/alarm and at first thought that it was my culprit. I unhooked all that, but the truck still does it at random times. I pulled the horn fuse for now so it doesn't drive the neighbors insane, but it still flashes the parking lights for a couple minutes several times a day, then it will take a break for a couple days then fire back up.
I thought it might be the factory keyless entry, but since I've had the remote start forever, the factory key fobs are long gone, so I can't see if it will turn off with those remotes.
I've checked all up under the dash and have not any moisture/leaking problems.
If I hold down the horn button while its having an episode, I can still hear the parking light relay that's in the RKE module in the center of the dash clicking on and off.
I have a factory wiring schematic book, but can't see where the RKE module ties into the horn circuit. I don't want to blindly start replacing modules or clipping wires, so I'm hoping that someone else has solved this puzzle before.