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I was wondering if anybody has ever heard of this problem I am having. I have a 1997 f250 light duty. the truck was sitting in my driveway and started turning over by its self. there was no one in the truck and no key in the ignition. This has happened two more times only the other two were when I was driving down the street. The last time it happened I was able to pull over and shut the truck off the ignition. the truck was still turning over I pulled off the small lead wire on the solenoid that did nothing so i pulled the battery cable.
I had a similar problem on one of my previous pickups with the starter not disengaging when I released the key from "start" to "on" and then still not disengaging when I removed the key so I would have to unhook the battery to make it stop. Replaced the starter relay, shortly after that the problem repeated itself. That happened a couple of times. Turned out I was frying the new ones due to some bad wiring. Check your battery cables, hot and ground, clean the connections, make sure they are tight etc. No corrosion, oxidation, loose nuts, whatever. That's where I would start and then if you find a bad connection, replace the relay again. Maybe someone else here will have another idea.
About 4 years ago our old 1989 F-150 did the same thing, well, it wouldn't start by itself (that would suck if it did, we always parked it with the shifter in first gear since the parking brake didn't work) but we had an incident where the starter wouldn't disengage. In our case it was the solenoid on the fender wall, but it wasn't fixed until after we replaced the starter that caught on fire and battery cables that got charred.
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