Here is the painless manual for non column keyed ignitions. Page 7 shows the maxi fuse wired off the starter large terminal in the alternator and the cab power wires.
http://www.painlessperformance.com/Manuals/10102.pdf
The factory uses fusible links and puts one between the battery positive and the
junction stud on the right fender as shown in the diagram below at the top.
The circled items are the fuses for the battery gauge wires and the SHUNT wire is the battery connection wire with the alternator to provide a path for voltage to the truck circuits with the engine off and the key on. It is also the charging wire for the alternator to charge the battery.