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Discussion Starter · #1 ·
I've finally made the journey over from the old forum! But on to my problem...

I have a 2005 Ford Escape. My battery light recently came on - I tested both the battery and the alternator and found that the alternator was bad, so I replaced it. Now when I start my car up, the battery light comes back on after a minute and stays on.

I attempted to reset the sensor by unplugging the battery, draining the electrical charge, accelerating...but the light still came back on. Could I have a bad voltage regulator? My voltage is as follows:

engine off: 13.7 V
engine on: 14.7 - 14.8 V
engine on, A/C, headlights, radio on: 14.7 V

I also read somewhere that if the replacement alternator was not a genuine Ford part, that the aftermarket voltage regulator won't 'play well' with the PCM.

Can anyone help me?
 

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I think that they've passed "some" of the charging control to the PCM these days.
 

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sounds about right to me. i had a focus that did that too. jonzo put a motorcraft regulator into it, and it was fine after that.

here's a test for you. take your meter, put one lead in the VR output connection, and the other in the battery positive. what kind of reading are you getting?
 
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