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  '64 1/2 to '73 -- The Classic Mustang
  Voltage Discharge Problem

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Author Topic:   Voltage Discharge Problem
shelby-428
Journeyman

Posts: 3
From: Nederland, TX USA
Registered: Dec 2001

posted 12-01-2001 08:34 PM     Click Here to See the Profile for shelby-428   Click Here to Email shelby-428     Edit/Delete Message   Reply w/Quote
I have a '68 Shelby when started shows the battery discharging. The alternator light is on and ammeter shows discharging. If you bring it off idle to about 1500 rpm, it will start charging and the light will go off. You can then let it return to idle and it will still charge. Turn it off and start it again, it will show a discharge until you bring up the rpm. I have replaced the alternator and the voltage regulator and it still does the same thing. Any ideas?

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SteveLaRiviere
Administrator

Posts: 24286
From: Saco, Maine Toys: '70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150
Registered: May 99

posted 12-02-2001 07:06 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
Is this a stock autolite alternator? What is your idle speed?

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shelby-428
Journeyman

Posts: 3
From: Nederland, TX USA
Registered: Dec 2001

posted 12-02-2001 09:19 PM     Click Here to See the Profile for shelby-428   Click Here to Email shelby-428     Edit/Delete Message   Reply w/Quote
They were either Autolite or Motorcraft. I had two and sent both to an alternator shop and they both checked fine. I also have tried two different voltage regulators. It probably idles at about 600 to 750 rpm.

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