Charging System with wild fluctuations.

[GARY MINKER]

Do you have a 4th wire on your alternator for external voltage and charge setting? It runs down to the batteries for sensing. If that wire is damaged, your alternator usually shuts down from lack of excitation. You did not mention if the wild swing is excessively positive or from crap to great. Check for this wire or one like it that is shorted to the output terminal. Gary --- On Sat, 9/5/09, Wayne Kotila wrote: From: Wayne Kotila Subject: Re: [WanderlodgeForum] Charging System with wild fluctuations. To: WanderlodgeForum@yahoogroups.com Date: Saturday, September 5, 2009, 12:29 AM Is your voltage regulator in your alternator or seperate and did you replace it? Wayne 1985 PT40 From: vabroker1 To: WanderlodgeForum@ yahoogroups. com Sent: Friday, September 4, 2009 8:03:16 AM Subject: [WanderlodgeForum] Charging System with wild fluctuations. I have a 1980 FC 33 Diesel that has suddenly developed wild charging fluctuations. The Volt Meter will fluctuate between 10-14 volts very violently and increase with engine speed. After about 20 minutes the fluctuation slows but shows a discharge on the AMP meter. I rebuilt the alternator with same results. Anyone with experience or comments would be appreciated.