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On most GM vehicles there are three posts on the starter. The main power supply and then one for solenoid to engage and the other is for ignition system. Make sure the vehicle is in park for automatic transmission with emergency brake on or neutral with the emergency brake engaged and block the wheels as well. I would try to jumper a wire from the main post to one for a second and
then the other (just a quick touch) to see if the starter is
functioning properly. If this cranks the engine over then check to see if you have the wires connected to the starter post or the ignition post. If they are attached correctly and it still will not crank over you probably have an issue further up in the wiring harness. Possibly a bad ignition switch, bad ground or a broken wire somewhere.
pretty hard one.
First check th e bellhousing to make sure no wires got caught.
Check starter for broken wires.
Put emergency on and adjust linkage for the stops to be correctly aligned.go underneath and loosen the 1/2 bolt on the linkage make sure trans is in park and move until it can't go up any more.
your starting point. now put gear shifter in neutral. feel the play in thetop
then in the bottom. you must equalize these distances so same loosness up / down..
If that doesn't work write back.
On your parking brake assembly is a single wire switch. You can unplug it, but you will have to remember not to drive with it set. To replace the switch the whole assembly will have to come out. The switch is about $20 and labor should run about two hours. Good Luck
The truck that you drive is know for being pretty reliable, if it were my vehicle and not had not been done yet i would; Transmission service (80-90k), complete hose check (for cracks and damage), fuel filter (if servicable), Cooling system flush, and regular scheduled maintence.
quick way to tell... next time it won't crank and just clicks... hit it gently with a hammer as you have someone attempt to start it... if all of a sudden it cranks.... it's the starter... replace it before it quites completely.