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Typical wiring in your vintage of truck with a 10si or 12si alternator -
Alternator charge wire is connected to the threaded BAT terminal on the alternator. Wire runs down the valve cover to a metal tube that is bolted to the back of the engine. It runs down through this protective tube to the large terminal on the starter. The fusible link is on the starter end of that wire. That same starter terminal is where the large positive battery cable is connected.

Alternate simplified wiring- Connect an 8 to 10 gauge charge wire with fusible link to the positive terminal of the battery . Run it straight across and down behind the alternator to keep it away from the belt, and connect to the BAT terminal.

There is also a two wire plug on the back of the alternator. One wire is the sense wire and one is the exciter wire. The red sense wire was originally connected into the wiring loom, but may have been connected to the BAT terminal if someone modified the wiring. The exciter wire should have 12 volts switched through the ignition. This is one simple wiring diagram. 10si wieifn - Google Search
 
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