My 97 ford explorer XLT w 5.0 and all options except cruise control, has a intermittent electrical problem, it starts fine and charges fine then sometimes the starter solenoid just clicks or the alternator will not charge, I have replaced the ignition switch, starter relay, solenoid and starter, and replaced the alternator checked all fuses and it works as it should sometimes and then will not start or not charge when it starts any help would be greatly appreciated