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When I turn the key you can still hear the glow plugs warm up etc.........then when you turn the switch.....nothing!
In no particular order:
I just finished putting in another GM starter and all it does it click. What gives, can a bad starter run down my batteries? Or is something wrong with the new starter?
Yes, a bad starter could have run down your batteries.
A bad connection could also be the fault. If all that happens is the solenoid is clicking, then you need to debug:
First... when you hook it up be sure to check the connections and that they are clean... then line it up with your eye and make sure that your "new" starter will properly engage with the flywheel, if it looks askew, then it won't engage properly or at all... and that needs to be fixed...
Next, get under there and have someone try and crank it while you watch it... see if its a starter problem (i.e. bendix doing nothing) or if its an alignment problem (i.e. bendix kicking the gear out and then - due to misalignment - gets stuck at the flywheel)....
Is this a Hummer starter? or just a replacement GM starter? It sounds like it might not be the OEM Hummer starter which would mean that you need to do some homework and make sure that everything is hooked up properly... make sure the power is to the power, ground is to the ground and the "switch" is to the switched terminal....
You can bench test it easy enough... take some jumper cables, hook them up to the positive / negative terminals of the starter and one of the batteries... then take a wire and clamp it to the positive side and touch the "switch" spot of the starter and see if it turns....
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