I have a 94 Ford Ranger 4.0 4WD. I had to replace the starter about two months ago and the pass few say it was starting up slow. It would wouldn't just fire up like normal. My friend sprayed starter fiuld on the starter itself thinking that would fix the issue, but when he tried this start stunt while I was gone the engine would even crank. It just clicks. I don't know if this is the issue it stoped working exactly because it was already having issues but the battery is fine, fueses are good, the cable to the ground on the starter is fine, and I tried banging on the starter with a hammer. It would almost turn a little bit and than it would just stop and nothing else. Don't know what else I can do besides get another starter to see is that is the issue or maybe even the starter core but I don't know how to check if that's bad or not

 

Welcome to the forum

New Starter doesn't mean it is a GOOD starter, they can be bad out of the box

A good battery has 12.3volts to 12.8volts after sitting overnight, or for at least a few hours
12.2 volts or lower is a failing battery

Measure battery voltage
Then measure battery voltage with meter's Black probe on the engine metal, should be EXACTLY the same
Then measure voltage with meters black probe on the engine and Red probe on the Starter motors Positive cable, should be EXACTLY the same.

If you have a set of jumper cables use those from battery to starter motor, by-passing vehicle cables, BOTH Ground and Positive
Then try to start
If still no start then either bad battery or bad starter

If starter works then battery cables are bad

Battery cables can "look good" but be corroded under the insulation, get a razor knife and cut back insulation a few inches, any white residue means corrosion, re-tape if it looks OK