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Ford is popular for the dashboard ( motherboard) shorting out & causing these problems. Any recall notices? call them first. Sorry I can't be more helpful from here, but I have R/R many of those due to electrical shorting & bad motherboards. Good luck
connect an amp meter in where the battery earth wire is and read the current draw with everything off. Low current indicates something like a glove box light or boot light and heavier current draws indicate something like a relay malfunction or a power wire just shorting out somewhere. Once you get an idea of the current draw take it to an accredited auto electrician and tell him of the result and he may have a good idea of where to start.
you have a dead short eather a pinched posative wire or you have a negative wire or a bracket toutching a posative hook up the neg. cable take a test light hook one end to the batt. the other end to the cable if shorted light will light start unpluging plugs and wiggleing wires till the light gos off and that should point you to the cause, make shore all lights and egnishion switch are off underhood light also.
get a wiring diagram, follow this circuit, wire by wire, start @ rear, your tail lights, check each bulb, then proceed to front, along frame rail, to switch & fuse block. test for continuity & shorts, bad wires, corrosion, etc
D4 light is an error from the TCU (transmission control unit), so you
got something going on with your transmission. If you want to pull the
error code, remove the passengers side kick panel and look for a pair of
wires with a blue connector at the end. Stick a paper clip or some
other piece of wire into each hole of the connector to short the wires.
Put your key in the ignition and turn 2 clicks. The D4 light will
flash the code...short flashes=1 and long flashes=10. Add the number of
short and long flashes to get your code. Errors are below:
0-Transmission control unit (TCU) faulty. 1-Lock-up solenoid 'A' circuit open or shorted. 2-Lock-up solenoid 'B' circuit open or shorted. 3-Throttle Position Sensor circuit open or shorted. 4-Vehicle Speed Sensor open or shorted - No signal from speedometer. 5-Shift Lever Position Switch circuit shorted. 6-Shift Lever Position Switch circuit open. 7-Shift Solenoid 'A' circuit open or shorted. 8-Shift Solenoid 'B' circuit open or shorted. 9-Counter shaft or transmission speed pulse generator open or shorted. 10-Coolant Temperature Sensor open or shorted. 11-Engine RPM (Ignition coil signal) open or shorted. 12-(No code 12 used) 13-Main shaft speed pulse generator open or shorted. 14-Linear (line pressure control) solenoid open or shorted. 15-Kick down switch circuit shorted.