Jeep not turning over - JeepForum.com

 
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post #1 of 5 Old 03-09-2013, 08:54 AM Thread Starter
jeep1000
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1985 CJ7 
 
Join Date: Aug 2011
Location: Austin
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Jeep not turning over

This is a simple question with simple answers but I figured I'd post incase I miss anything. Last night, I went out to my CJ7 to go somewhere and when I turned they key, it wouldn't turn over but there was a small short noise like a click or thunk. I couldn't turn on any lights but my radio and interior lights came on. When I tried to turn on my lights with my interior light on, it took the juice from them. This morning I jumped it and figured it was the battery and drive to austozone. They ran a check and it came out fine. I have noticed that my horn has been very sensitive and sometimes will turn on without my pressing it, just turning the wheel. I'm thinking its some kind of short, my battery had just enough of a charge on it to pass, or something weird with my alternator (I just had work done on it in the past few months.) any other ideas?


Jonathan
'86 CJ7, I6 258 four speed manual. See ya on the trails!
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post #2 of 5 Old 03-09-2013, 09:43 AM
PostDoc
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1971 DJ 
 
Join Date: Dec 2012
Location: PHX
Posts: 36
You might check the connection between the solenoid and the starter motor - or your grounds. As many have said here before, if it's a wiring problem, 90% of the time it's the grounds.
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post #3 of 5 Old 03-09-2013, 01:28 PM
Dadamsnv
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1977 CJ5 
 
Join Date: May 2012
Location: Reno
Posts: 5,233
Easy check on the alternator is get her running and probe the battery posts with a voltmeter.

A good battery will sit mid to high 13 volts across the posts without the jeep running

A good alternator will sit mid to high 14 volts across the battery posts.

Also check your battery connections and alternator connections.

Cheers!
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post #4 of 5 Old 03-09-2013, 01:30 PM
Dadamsnv
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1977 CJ5 
 
Join Date: May 2012
Location: Reno
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If your alternator tests good, you can pull the ground wire off your battery while its off and sitting and run an ammeter from the negative wire to the negative post to see if you have a short pulling current while the jeep sits.

Cheers!
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post #5 of 5 Old 03-11-2013, 10:57 AM Thread Starter
jeep1000
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1985 CJ7 
 
Join Date: Aug 2011
Location: Austin
Posts: 335
Thanks everyone. It was the started cylinder and the faulty wiring between it and the starter.

Jonathan
'86 CJ7, I6 258 four speed manual. See ya on the trails!
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