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Username Post: Run away starter`        (Topic#356578)
gchemist 
Senior Chevytalk Moderator
Posts: 24977
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
05-28-19 01:39 PM - Post#2767241    

The '95 Jimmy has a problem. It will crank on its own draining the battery. I think the problem is in the key switch. Sometimes, you can turn it without the key! Has anyone seen a similar problem?

I'm going out to tomorrow with my Power Probe IV. I can test the starter by powering it at the relay circuit.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles


 




gchemist 
Senior Chevytalk Moderator
Posts: 24977
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
06-03-19 08:11 AM - Post#2767598    
    In response to gchemist

Ok, I went and changed out the starter in a parking lot. I'm glad I had my 1/2" impact. One bolt was too tight to take off with a short ratchets. Not a bad job. Used a small jack to raise the wheel. Used a 4x4 piece of wood under the wheel. It was enough clearance to get under it. Afterwards, same problem. We went for a new key cylinder. I replaced it fairly quick. Same problem. Apparently, the problem is in the key cylinder housing. If you wiggle it enough, the starter will crank. It will not start since fuel and ignition power is cut. I determined if the wheel is locked and key is out, it will not crank on it's own. If you wiggle it too much, it will try to crank. The new cylinder is tight compared to the old one. A permanent solution may be to replaced the column. Or other another internal column part.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles


 
gchemist 
Senior Chevytalk Moderator
Posts: 24977
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
11-10-19 04:17 AM - Post#2779882    
    In response to gchemist

Update: I tried to bypass all ignition fuses. It would still crank away. I tried to ID the crank relay. Even after unplugging three in the engine bay and two in the glove box, it would still crank. So finally, decided to cut the starter solenoid wire. The starter was burned up from its last crank episode. A local shop sold me a smaller gear reduction starter. It it went in fast and cranks crazy fast. I ran wires into the dash with an off/on switch. It won't crank on it own unless the switch is left in the on position. To start it, the switch must be in the off position. The key is turned to on, flip the switch to on, then key crank to start it. Once it starts, the switch is flipped back to the off position. So far the owner has not called back. I guess it's working good. No more mysterious auto cranks or dead battery.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles


 




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