how to read alternator voltage regarding manufacturer data?

1990 OPEL CORSA
220,000 MILES
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XCHCUI
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  • 91 POSTS
when the car manual said:alternator voltage should be between 13.7v and 14.75v,does the spec refer to the voltage reading between the battery poles(when engine running of course)or between alternator b+ connection and battery negetive pole?because the voltage between the alternator b+ and battery negative pole is higher from between battery poles(because of voltage drop)so what is the correct test that refer to manufacturer data?
best regards
igal
Nov 21, 2011 at 5:33 PM
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RASMATAZ
  • ✓ASE Certified Mechanic
  • 75,992 POSTS
  • ASE Certified Mechanic
I normally do the voltage tests at the alternator-your readings sounds about right-
Nov 21, 2011 at 5:48 PM
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