Starter problems - electrical malfunctions -
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Unread 05-02-2013, 10:57 AM   #1
Registered User
1995 YJ Wrangler 
Join Date: Oct 2011
Location: , Colorado
Posts: 38
Starter problems - electrical malfunctions

My starter sometimes runs while I'm driving. If I'm coming down a hill, or up to a stop, and I'm letting the engine brake me, the starter will begin to run, but the gear won't engage. It just spins non stop for about 10 or 15 seconds - sometimes I have to disconnect the battery or hit it with a hammer or something. It does this once or twice a month. Something is giving it the signal to run, and power to do so, when it shouldn't.

Also, under the same circumstances (engine braking at 2500-3000 RPM), my lights will sometimes flicker and dim very briefly, radio might cut out for a half second, and then it all comes back.

I'm rather stupid electrically, and I'm afraid there's something wrong in the wiring maybe. This all started when I replaced the starter about a year ago. It's installed correctly, and even if it was messed up, would that somehow affect the other systems as well?

4cyl 2.5L
stock everything

ruckerbo is offline   Reply With Quote Quick reply to this message
Unread 05-02-2013, 11:10 AM   #2
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1991 YJ Wrangler 
Join Date: Apr 2008
Location: Meridian, Idaho
Posts: 2,554
Have you tried removing your starter relay when this happens to see if the starter shuts down? If it does, then either the relay or something further up stream (ignition sw) may be at fault. If it continues to run and you are sure the brown wire is not shorting to anything, then first guess would be a bad starter with internal/intermittent short. Especially if smacking it causes it to stop. Weird though, that your starter does not engage the fly wheel when this happens. I would address this first, then worry about the lights if that problem remains after the starter issue has been fixed.
idaholtby is offline   Reply With Quote Quick reply to this message
Unread 05-02-2013, 12:09 PM   #3
Registered User
1994 YJ Wrangler 
Join Date: Oct 2011
Location: Reno, Nevada
Posts: 487
Just a stab here, but have you pulled the starter out and checked it? There could be a short that is allowing the motor to engage without the key. If my memory is correct, i believe the hot wire from the battery drives only the starter. If this is shorting out, it would cause the starter to spin, without engaging the flywheel.
jsipe007 is offline   Reply With Quote Quick reply to this message

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