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Charging System with wild fluctuations. - Printable Version

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Charging System with wild fluctuations. - vabroker1 - 09-04-2009 01:03

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.

Charging System with wild fluctuations. - cape0001 - 09-04-2009 01:24

Check and test the voltage regulator
check all the cables to the batteries I think you have a short or bad ground
Stephen
Dupree Products



--- In WanderlodgeForum@yahoogroups.com, "vabroker1" wrote:
>
> 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.
>

Charging System with wild fluctuations. - Wayne Kotila - 09-04-2009 16:29

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.



Charging System with wild fluctuations. - gregoryoconnor - 09-04-2009 16:48

is the belt tight? run it and spray belt dressing to see if it fixes the problem
prior to adjusting. I would drop it off at a good shop to bench test if it
needs to come off again. could be an incompatible part used in PO rebuild then
duplicated in your rebuild.
Stp makes a sticker about the size you need.

Greg of Tim&Greg
94ptca .

--- In WanderlodgeForum@yahoogroups.com, Wayne Kotila wrote:
>
> 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.
>

Charging System with wild fluctuations. - GARY MINKER - 09-05-2009 23:46

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.