[dsraven]

-so no starter operation but other electrical stuff works?
-use booster cables to go directly to the starter and that will bypass the rest of the truck wiring. jump the solenoid at the starter, while in neutral and wheels blocked-park brake on etc, see if that works
-if that works, and it should if the starter was checked out as ok, then the problem is with the wiring in the truck. who knows what was done previously in the last decade. you may have to trace the wire manually to ensure something hidden under the dash didn't get unplugged, like a firewall bulkhead connector or a jury rigged push together plug in somehwhere etc.maybe a new wire to the starter is in order so you know what you have
-once it cranks over, and possibly starts up, check to see if there is a ballast resistor inline with the coil on the engine run circuit. I assume you have points style ignition system. there should be 12v to the coil at start up but then a lesser voltage, like 9v, after the key start or start button is released. this is to ensure the ign coil doesn't get overheated. it is wired from the solenoid on the starter. when the solenoid is activated it powers up a connection on the starter that is usually wired to the coil and is only powered up when the starter is being used. it gives a hotter spark for starting but 12v all the time to the coil will fry the coil.