Had problems with the truck starting. At first knocking the starter would get it going. Now nothing helps. Replaced starter and still won't start. Just clicks once.

hi olga.
The starter won't crank. If nothing happens when you turn the ignition key to the "Start" position, it means that the starter motor doesn't turn over the engine. Most commonly this could be caused by a dead battery; here is How to check the battery. ... The starter motor itself or a starter solenoid could be bad.13 Aug 2013

Why a car won't start - troubleshooting tips - Samarins.com

or go to this link might help.
engine won start Google Search

All you did was replace the starter and all of a sudden it overheats and wont start? were there any symptoms before the starter got replaced? the starter should have nothing to do with it overheating, maybe not starting, but not overheating. have you checked the thermostat to make sure it isn't stuck closed? or a possible coolant leak?

Have you had the flywheel ring gear checked out for worn or broken teeth this can can stop the engine turning over

Sometimes new starters have to be shimmed so that the gear on the starter lines up with the gear teeth on the flywheel on the motor. The grinding noise is the reason I say that is what's wrong. If there were shims already there, try taking them out. I hope this helps you

either check your knock sensor, map sensor or fuel shut-off switch

How about corroded battery cables (internal)

Fusible Link wiring corroded & open circuit,does
everything electrical work except the starting circuit?

Turn key & have power to starter solenoid ?
Neutral Switch !
Ignition Switch !

Tough to guess without wiring diagrams,
to see where to start testing

Can't fix what you don't know you have

Won't start or won't crank ? ?
If it won't crank you might have an engine problem such as a broken timing belt.

check for the starter motor but I suspect a flywheel gear worn. By removing the starter motor would be easier to check the flywheel gear.

maybe a flywheel problem; or a bad spindle on your starter..your local mechanic can help you with that..thats what is may be