I have a 1986 M998 that the starter solenoid burned out on. I replaced the solenoid and starter with a good used unit. When I hooked the batteries back up the starter engages and tries to start the engine. The problem is that wire ( 74A ) to the starter solenoid is hot all the time the batteries are hooked up even with the ignition switch in the off position. The ignition switch is working correctly ( tried a spare with the same results). At this point I suspect the power control box but I do not have a spare to try. Am I missing something or should I go ahead and order a replacement PCB ? M998 with a 6.5 and 200 amp alternator if it makes a difference.