So I'm new to the forum as a member but I've used it just searching in the last couple months for help with other things I've had to work on/replace, but I'll keep this brief. Last night I came back from being gone for 2 weeks and no one was driving my Jeep while I was gone, upon return last night my battery had no power and when we hooked up for a jump start, it began to turn over on its own, no key in ignition or anything. It started when I turned the key and ran so I could at least get home, but it sputtered out and the dash/dome light started freaking out. In any case, I'm kind of at a loss. Possibly starter not disengaging, or ignition faulty? I'm doubtful my battery is the issue. In any case, and help here would not go unappreciated.
Have your battery load tested as it should have no issues keeping voltage for two weeks without being used. As to the cranking when you hooked up the jump pack, when you tried to start it, sounds like the starter solenoid got stuck engaged. This will happen occasionally when you try to start with a very low battery and then when you give it good voltage it will send voltage to the starter without turning the key. I would replace the solenoid/solenoid as it may stick again. You are lucky that it disengaged after the jeep started or you would have messed up the starter and the flywheel/flexplate. Battery and starter/solenoid are cheap in the whole scheme of things, so if it were me, I would replace the battery, starter/solenoid and make sure the cables/connections are clean.
80 CJ-5, 74 CJ-6, 56 CJ-5
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