My Starter runs by itself or blower stays on with key off – Ford Trucks
Owners of Ford trucks may experience a starter motor that engages all by itself. Or, they may discover the blower motor running with the key off. This may sound like a bad ignition switch (and may be), but first check out the interior fuse panel. Any leak in the windshield (which is common) may cause corrosion inside the fuse panel. Locate the fuse panel and look for any signs of moisture or corrosion. If you find any, have the windshield leak repaired (resealed) and then replace the fuse panel. Don’t try to clean off the corrosion–it’s toast.
FYI, a leaking windshield can also cause a Generic Electronic Module (GEM) to act up.
© 2012 Rick Muscoplat