All the schematics I see shown call for a 3 wire connection to the 1G Alternator but my harness has 4 wires. (74 F100 2wd)
Along with the large 10ga wire you ground on the alternator, the orange to the BAT and whiteish one to the FLD there is a smaller black wire that had a metal clip attached that fell off to a hard rubber "boot" that's just hanging there. Where does that go? Thanks for any help.

 

Here's one I had handy. Won't vouch for colors, but it is a 1G.
Edit: Just read your other posts, see how multiple posts can confuse people. You have enough info to fix.

 

No, no, no. The largest of all the wires is the alternator output. If you're connecting this to GND instead of the BATT terminal, then I think we've found why your fusible link popped when you connected the battery.

The large output stud (BATT) of the alternator goes to the battery post of the starter solenoid through a fusible link. The FLD stud goes to the F terminal of the regulator. The STA stud goes to the factory electric choke (if equipped), and if your truck has an ALT light in the dash instead of an amp gauge, then the STA stud also goes to the S terminal of the regulator.

Some harnesses also have a ground connection, to keep the regulator and alternator at the same ground for added insurance. This may be your fourth terminal in question. You'll need to beep out your harness with a multimeter (set to continuity) to be sure. You should do this for all four connections to be safe.

 

GFW1985

Thanks! That is a lot easier to read that the one I posted in his other thread.