Re: electrical/power issue. need help
The first thing I'd look for is a loose, corroded or broken ground wire under the hood. There are grounds bolted down on both the right and left inner fender aprons (about halfway back on each side). There is a ground bolted on the driver side of the radiator core support near the battery and another on the firewall near the PCM. Typical color codes for ground wires under the hood are solid black, black/yellow and black/white.
2003 FX4 Level II, Supercharged 5.0L V8, Headers, Duals
BW4406 manual transfer case, Aussie Locker, Torsen L/S, 4.10's
Bilstein 7100 rezzies, Cadillac/Mustang rear discs, Duff traction bars
Keypad Entry, Lock LEDs, ABS switch, sway bar discos
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2003 XLT 2.3L M5OD-R1 reg cab beater, 2011 Taurus SEL, 2016 C-MAX Energi Plug-in Hybrid