Yes, there is a red/light blue stripe wire that runs from ignition switch to fuse 21 in cab fuse box, fuse 21 should have 12v with key turned to START
Out of fuse 21 will be a white/pink wire that runs to clutch switch, above clutch pedal on the pushrod
Then out of clutch switch on a pink wire to firewall
At firewall wire can stay pink or change to tan/red in engine bay
But in either case it runs to the starter relay in the engine fuse box
Ignition switch(START)---------(fuse 21)-------(clutch switch)-------------(starter relay)
Cab fuse box is the SJB(smart junction box) which is the Body Computer
These have a known issue for corroded connectors, seen here:
https://i1.wp.com/sparkys-answers.com/wp-content/uploads/2016/10/DSC09929.jpg
Connectors have a lever that you lift up on and that pulls up connector away from SJB so you can then pull it off the rest of the way
I would pull fuse 21, then with a grounded meter I would test both fuse 21 slots for 12v with key turned to START, one should have 12v
If so put fuse back, ignition switch and red/blue wire are OK
Then pull out starter relay in engine bay
With key OFF, with grounded meter test each slot in relay base one should have 12v, remember that slot
Then have helper turn key to START and PRESS DOWN clutch pedal, and test the other slots, another slot should now have 12v
Diagram shows automatic trans as well, it uses DTR switch which is not used on a manual trans vehicle