Alternator Over Charging

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Jul 19, 2009 | 09:36 PM

nivek

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Joined: Jul 2009

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Alternator Over Charging

Hi Everyone,
I looked in past threads and found alot of alternators failing to charge but my problem is my alternator at idle charges fine but as I increase the rpms it will top out at around 17 volts @ 2000 rpm. Also, I am hoping this is related, my batteries will completly drain overnight if I leave them conected. Is my alternator faulty and causing both problems?

I have a 99 f-350 7.3l power stroke with 90 000miles on it.

thanks

Jul 19, 2009 | 10:09 PM

megawatt00

Hotshot

Joined: Jan 2008

Posts: 13,144

Likes: 11

From: Rochdale MA

It is time for a new alt and a new set of batteries. With the alt over charging it is damaging the batteries also.

Jul 19, 2009 | 10:17 PM

Tenn01PSD350

Post Fiend

Joined: Feb 2006

Posts: 11,892

Likes: 2

From: Middle Tennessee

Quote:

Originally Posted by nivek

How have you obtained your readings?

EDIT: You may have a short in your wiring causing all of this, or not. I hate electrical gremlins.

Jul 20, 2009 | 12:04 AM

nivek

Thread Starter

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Joined: Jul 2009

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I've been just reading the voltage gauge on the dash. As the rpm go up so does the gauge and I have to turn on everything electric to keep it at 17v or it will go higher.

Jul 20, 2009 | 01:05 AM

Kwikkordead

Fleet Owner

Joined: Jun 2004

Posts: 25,090

Likes: 1,111

From: Rio Rico, AZ.

Quote:

Originally Posted by megawatt00

It is time for a new alt and a new set of batteries. With the alt over charging it is damaging the batteries also.

Jim nailed it.
Those batteries are boiled because of the faulty alternator.
Replace them all and be done.

Jul 20, 2009 | 01:18 AM

ChunderDownUnder

Cargo Master

Joined: Apr 2009

Posts: 2,135

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From: Man Cave

Wont the alternator overcharge if you have a bad cell or battery. Tyring to over compensate for the decreased battery performance ???

Jul 20, 2009 | 12:19 PM

1Aauto

Former Vendor

Joined: Mar 2009

Posts: 8,098

Likes: 10

From: Westford, MA

Quote:

Originally Posted by nivek

Welcome to FTE. We offer brand new alternators not rebuilts like most parts stores offer.There's also no core charge.

Here's a link to the alternator section on our website.

Ford Truck Alternator