GST97

I recently went through starter problems with my 92.

The best way to test it... is have a friend in the cab with the key.
First, check power at the input of the starter relay on the fenderwell.
Next, hold your multimeter on the output side of the relay and have your friend turn the key for a couple of seconds, see if you get a full 12V when the key is turned.

If you have power there, get under the truck with your multimeter. Check for power on the main red large gauge cable leading to the starter. Make sure you have full 12V.
Next, put your multimeter on the remote wire (small push on connector) , have your friend turn the key for a few seconds and see if you have power.

If everything turns out well, check the solenoid on the starter itself.... My problem was that the wires that connected to that solenoid through the center rivet had broken and I had to resolder them to the push tab.

If all of this checks out, post back and we can go from there.

-Chris