Hey all,
Twice in the last two years I have gotten the check engine light along with low voltage and the #47 (I think) code indicating voltage expected low. Both times I was able to tap the alternator and the symptoms disappeared for the better part of a year. Obviously, I seem to be experiencing a failing alternator, but could it be anything else: loose diode, other, etc? I've never had a failing alternator be fixed with a slight tap and have it work fine for such an extended period. Thanks in advance!

D

 

I didn't know these had CELs on them as mine has never turned on. Guess I need to see if I'm missing a bulb.

 

Your 90 doesn't have a PCM, therefore doesn't have a check engine light. I believe this to be true, but I am not 100% sure...Mark

 

Another reason I like my 90'

 

And one less light bulb to replace.

 

Yep my 91 didn't have a CEL bulb either, but has anyone experienced this issue? I could just replace it, but, maybe, it's not really the alt.? Bulb talk may continue now

D

 

Check the field connections real close. I've seen wired things like this caused by a very slightly loose crimp, or an oxidized connector.