I've had a sticky starter solenoid do this to me. I just hit it with a hammer and it's been working since. But you could replace it too.
It could be that the starter pinion drive (also known as the bendix) is worn. If it is grinding and roatating slowly, then the bushings are worn. In either case, you neep to overhaul or replace the starter.
To my knowledge, there is no cable that grounds the starter to the frame. The starter is grounded when is bolted to the flywheel housing.
If the starter has been grinding against the flywheel for quite some time there is a GOOD chance that the flywheel is stripped. On the other hand, if it just started and it's engaged thoroughly in the past, you probably just have a bad starter bendix. Pull the starter then use a screwdriver or some other tool for prying to slowly turn the flywheel and inspect each tooth of the flywheel. Look for any that are significantly worn down or missing. If ANY fit that category you will need to pull the engine or transmission and replace the flywheel or flexplate depending on whether it's a manual transmission or an automatic.
synchonizer worn in transmission
How do you remove the flywheel on a 1999 ford ranger
The starters will not interchange. The starters do not align with the bolt holes and flywheel.
it may be that your flywheel is loose, and the starter is jumping the teeth,
The starter is usually located on the passenger side, under and to the rear of the engine where it bolts up to the flywheel housing. You will recognize it by the red cable and small wire that connect to it. Good luck
what are the torque specs for the flywheel on a 92 ford ranger?
Pressure plate to flywheel bolts - 24 ft/lbs
starter not meshing with fly wheel . you need new starter ,right side of engine two wires three bolts pull negative battery cable first brake on for safety or you have a low battery and its not turning starter fast enough to engage you don't say what kind of noise.
they are 56 to 64