I have a 1994 ford f150 xlt 4.9l 2wd single cab... I recently changed the neutral safety switch and afterwhich it wouldn't start so I replaced my battery, the starter motor, the starter solenoid, and the ignition switch; I manged to get the truck started by bypassing the starter solenoid and now the battery is reading low voltage but won't start on when I try the key ignition. Not sure what or where the problem might be at, need some help.