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Duramax 6600 Discussion Forum for the Duramax 6600 Diesel Engine, including the LB7, LLY, LBZ & LMM engine specific topics.

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  #1  
Old 05-18-2012, 06:43 PM
VDZdmax VDZdmax is offline
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Default 2003 2500HD won't turn over...any ideas?

I have been having erratic starts out of my 2500HD. Lights come on like normal and when you turn key after glow plugs go out nothing happens. No bump, no grind, nothing. All the dash lights go out like the batteries are dead, but let up on the key and everything comes back. Try it later, or again and it may start!? I have changed out the neutral safety switch, had a repair shop tell me it was the starter( it wasn't), and now they are stumped. I am wondering about the ignition switch, but don't like swapping parts just to "try" a fix. $$$ Batteries are fine. I thought I had seen a thread on this very problem, but can't seem to locate it. Was hoping someone a little more savvy on the searches could point me in the right direction...
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Old 05-18-2012, 07:30 PM
DmaxMaverick DmaxMaverick is offline
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Welcome aboard!

It could be a number of things. The most common is a poor connection at the batteries, starter or grounds. There's also a starter relay in the underhood fuse box (over the driver side wheel well). The ignition switch is a possibility, just less common.
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Old 05-19-2012, 11:06 AM
Hound Hound is offline
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Have you had your batteries load tested?
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