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Need help on 94 ranger either short or bad alternator or something else


Mechrick said:
So it runs with the belt off, but alternator connected?

At this point I'm going to suggest removing the PCM, taking the cover off and getting a good look at the electrolytic capacitors on the circuit board. Look for swelling or leaking of the barrel-shaped caps, if they leak there will be a white stain on the circuit board.

If this checks ok, then you will be unplugging and checking *all* of the PCM's outputs. First things first though.
Click to expand...
If he has a PCM problem, why would it run ok on just the battery?
 
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