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So, just looked at the -20P at the engine oil fill grommet. Next page has the part number, googled it with "grommet".
https://www.google.com/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=14028942%20grommet
Replace your rubber supply lines, if you haven't already. They are well known for air leaks causing loss of prime and idle issues and slow acceleration.
Also, the fuel pickup tube in the tank is well know to rust near the top of the tank(inside) and cause the same issues.
If your stater will not turn the motor over, as I'm understanding then you have a starter problem, not a glow plug issue.
The GP controller and the GP relay have nothing to do with the engine turning over.
I feel that there is just too little fact being posted in this discussion and way too much opinion/personal interpretation/wag.
That's my stance on this topic.
Just a google search away... http://www.parttarget.com/5330-01-456-3884_5330014563884_534059-60.html
nsn + parttarget. Then look for manufacturers and their sku.
534059-60
SKF USA Inc.
fwiw, I'm not trying to "stir the pot".
Not much of a conversation when everyone just nods and agrees.
I don't agree with many of the comments on this topic.
Some of the rational posted by humvee owners simply astounds me.
So, you guys have collapsible steering columns, reflective marker and taillights that are dot approved? Crash rated bumpers? Crumple zones that meet fed standards? Side door bracing for side impact collisions? Pass rollover tests?
The list goes on...
Just because some guy says it's ok, does...
Or something like this, for about half the price. http://www.littelfuse.com/products/switches/battery-disconnect-switches/2484-single-pole-switches.aspx
I'd say it's time to lay under it with your meter.
See if you have 24v on the big cable on the starter, and see if you get voltage to the solenoid when in the crank position.
You might be suprised and find your starter hanging by the wires...