New Alternator and battery - low alternator voltage

Tiny
DPCAXX
  • MEMBER
  • 2003 FORD EXPEDITION
  • V8
  • AWD
  • AUTOMATIC
  • 65,000 MILES
I have tried two different alternators with the same results. The system wont come above 12.1 vdc and the battery indicator is on. The engine stalls when the battery is disconnected. Its like the alternator is not being told to turn on. Is this a PCM problem? I cant find a "alternator" fuse
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Saturday, January 9th, 2010 AT 3:12 PM

4 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check fuse no. 9 10 amp in central junction box behind right kick panel-If okay could be the computer control of the field generation driver circuit.
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Saturday, January 9th, 2010 AT 5:05 PM
Tiny
DPCAXX
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Fuse location 9 is a blank. No contacts. Someone suggested that the output from the PCM may be bad. I have 9vdc and 13 vdc coming from the PCM to the alternator. Anyone know if this is the right voltage?
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Monday, January 11th, 2010 AT 9:12 AM
Tiny
RASMATAZ
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I think the fuse location is mixed up is should be #f1.9 in the engine compartment fuse panel. Here is the location.
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Wednesday, January 13th, 2010 AT 11:43 AM
Tiny
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That did it all fixed thanks for your help. I love this site.
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Wednesday, January 13th, 2010 AT 2:49 PM

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