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On Isuzus the PCM monitors the alternator output. If there is a problem it will cut out all "non essential" equipment. The blower, rear defroster, etc. are considered non essential. That way it will allow as much power as possible to try and get you to where it can be fixed.


Yup, been there before. My Rodeo would start and remain running, but no blower fan and battery light on the dash. I think the shop that tested my alternator said bad L termanial. After replacing the alternator, everything returned to normal.

I agree, definitely sounds like an alternator to me.

-Rob