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Go Back   Hummer Forums by Elcova > Hummer H2 Discussion Forums > Technical Discussion and Customizing your H2

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  #1  
Old 05-26-2008, 08:03 PM
jedwilli jedwilli is offline
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Default Will not crank unless bypass relay

I have a 2003 H2 that will not start unless I use a jumper wire on the relay to manually engage the solenoid. I've checked the wiring, the neutral switch, the ignition switch, etc. I'm at a loss.

Any ideas to help me troubleshoot this?

-jw
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Old 05-26-2008, 10:37 PM
jedwilli jedwilli is offline
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Default Re: Will not crank unless bypass relay

I replaced the ignition switch - still no joy. To be clear, a hot wire to the solenoid and it fires right up. Proves starter and solenoid are fine. I've checked the neutral switch as well - it appears to be working. Any ideas I would appreciate it.

-jw
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Old 05-27-2008, 01:53 PM
jedwilli jedwilli is offline
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Default Re: Will not crank unless bypass relay

I also traced the wire from the solenoid to the fuse box and can use a jumper at the fuse box. It starts at that time. Checked all the fuses multiple times. Could it be the main computer?
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Old 05-27-2008, 06:03 PM
jedwilli jedwilli is offline
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Default Re: Will not crank unless bypass relay

Anyone have a suggestion?
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Old 05-27-2008, 06:09 PM
Planohummer Planohummer is offline
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Default Re: Will not crank unless bypass relay

look under the dash, around steering column to see if anyone has removed either an alarm or a remote start system. ck purple and orange wires specifically.
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Old 05-27-2008, 07:52 PM
jedwilli jedwilli is offline
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Default Re: Will not crank unless bypass relay

Nothing that I can tell. I've had this thing for a couple of years - it worked great until last week when I backed it into the driveway - then this behavoir started. Can you or anyone give me a wiring schematic for the igntion circuit. It seems like something has been cut or something. I did take the fuse box cover off (under the hood) and I had a nice little mouse nest - but I do not see any chewed wires. I'm at a loss.

-jw
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