The headlight power feed, and the majority of the rest of the power feeds originate at the junction post on the fender.
Follow the positive cable from the battery positive post around to a plastic looking junction box on the inner fender...
Post us a pic of the inner passenger fender near the battery showing both of the battery leads...
It is possible your truck has been modified previously...it may have a battery cable direct to the starter solenoid and a smaller gauge wire on the positive battery clamp thru a fusible link, then to a smaller junction post on the fender...
If yours is the second style described, the loss of everything could be as simple as a bad connector on the positive battery lead....
Post a pic and we can see how its wired.
