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Hi there. I just bought a 2004 GMC Duramax and when I went to look at it it ran fine. Has no reverse or interior lights for one. But my big problem is I can go out & start it one morning and then the next it won't start. I turn the key to on and I've got power to everything but no gauges move or nothing happens except the cluster will light up but no gauges or dummy lights even cycle like normal and then I try to crank it over and nothing. After I try I hear a click with about a 3 second delay.
 

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had an issue with my 03 lb7...injectors had been replaced, when no start occurred i gave up and sent it in,..turned out a couple of wires had worked loose in the plugs for the main engine harness
 
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