Usually the feed for your instrument cluster, goes hot with key on. Check feed to and from ignition switch. Maybe a problem with instrument cluster or wiring connector? I don't know model year? Usually f100 is an older vehicle, nothing wrong with that, accept, my database probably won't have wiring diagrams for you vehicle, I can't track wiring circuits. good luck.
Search Ford F-100 Questions
Ford F-100 Experts
#1G A ArneReputation620
Find great deals from top-rated dealersSearch
Related Models For Sale