Is my started motor going ??

[Talkwrench]

Are these symptoms my starter motor going?

Seems to be when the motor is hot it wont crank , trys and dies like a flat battery. If the motor is left and its cool it will start, I can hear a slight struggle but it will. It takes two batteries to start it, again if left so the motor is only warm , once hot even two batteries wont start it.

I do have a solenoid in the system I checked it by bridging and it clicked and I heard the starter motor try crank. Could this still be at fault?

All connections seem good and tight, I will still pull one at a time to clean but not hopeful.

I am taking the battery to be load tested today, but Im sure its fine, I did try another battery with the same results.

The starter motor should not be old as I was told a new one when I bought the truck last year, maybe only a few years old and hardly used, looks newish. I don't know if it is a 6 volt or 12 volt? truck was converted to 12 volts before I got it, I have been running a 12 volt Alt for a while with no probs.

Could it be anything else I have not thought of?

Next question would be how do I remove the starter on one of these if that's the problem ???