Re: Intermittent Complete 12V Power Loss / Ideas ?
Mystery no start the car has all electric and engine will not crank (turn over).
Surely you have already resoldered the RCM by now anyway.
You say battery terminals are clean. How about the inside of the terminals where they contact the battery posts?
Grounding sounds like a likely problem.
Powertrain control module would be a worst case scenario.
Hope you find it!