Join Date: Oct 1999
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Re: Battery or Alternator?
you have a '94, you can check the codes yourself....the main reason why i suggested it in the first place. 88-95 trucks are OBDI, which means, easy computer system compared to OBDII starting in '96. anyway, get a paperclip and that's as expensive a code reader as you need.
BTW, i just replaced my alternator for the exact same things you're having problems with. the alternator and battery chekc turned out fine, but my reading was still low. apparently, alternators can still be bad and the check not reveal it. i thought i had something draining my power as well...my alarm first came to mind. if you finally get stumped and fed up, have your battery tested to make sure it holds charge. if so, then change out your alternator.
while you're at it, check the belt tensioner and make sure it doesn't move or rattle at all with the engine revving. if so, that could be a problem too.