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Old 07-20-2012, 03:14 PM   #1
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Alternator Life on a Diesel

Has any one got over 100,000 miles on their alternator? I am taking a 6000 mile trip with my 2003 330 Cat 3126 and hoping for a little more life.
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Old 07-20-2012, 03:38 PM   #2
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Unless you're seeing some problems with the alternator, why would you be concerned about the 100k point? As far as I know, the alternator is not directly connected to the odometer, so it doesn't know what mileage you have on the rig. I expect my alternator to last to at least 250k miles or beyond. These diesels are tough and commercial trucks regularly go 1 million miles or more. Take care of it and it'll last.
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Old 07-20-2012, 04:01 PM   #3
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If the charge/discharge meter on your dash isn't doing weird stuff, I'd not worry about it.
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Old 07-20-2012, 07:29 PM   #4
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like pigman said,it's not directly connected to your odometer.I've been an auto mechanic for 40+ years and have seen alternators on new cars go out in a few thousand miles and I've seen cars with two to three hundred thousand miles with the original alternator.so,as they say,"if it ain't broke....don't fix it"
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Old 07-20-2012, 07:55 PM   #5
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Get all the info you can off the alt; brand, amps; and have the info with you as you travel, ask your local parts store about availability, or re-man part number. Any / all info you have,can shorten your down time should the worst happen. Outside of that , Safe Travels, run the gen set if you have to.
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Old 07-20-2012, 07:59 PM   #6
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Mine died at 4 years/40,000 miles.

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Old 07-20-2012, 08:37 PM   #7
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We have over 106,000 on our 145 Amp GM HD alternator with no problems so far. Knock on Wood!
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Old 07-20-2012, 08:52 PM   #8
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The alternator on my Discovery went to 90,000 mi. and died in an ice storm in St.Louis, MO. Stayed over 2 days to get it fixed, after a little over 4,000 mi. it died again, same place so took it back to the same dealer. They tried to fix it, but it wouldn't work, so they replaced it, for a nominal fee. Now, after 2,000 mi. it is still working, YA!! LOL!! Losing, the alternator is not to big a deal, don't worry about it.
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Old 07-24-2012, 06:20 PM   #9
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In six thousand miles of travel, you will some time be near a place that will replace your alternator if needed.

Carry a jumper cable to run from positive to positive between your house and chassis batteries when needed. Run the generator. It will provide the charge to the house batteries and hence the engine battery to keep your transmission functional.

Your engine does not care if the alternator is defunct.
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Old 07-24-2012, 06:27 PM   #10
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Quote:
Originally Posted by deandec View Post
Run the generator. It will provide the charge to the house batteries and hence the engine battery to keep your transmission functional.

Your engine does not care if the alternator is defunct.
Good advice. Running the generator got me several hundred miles until I could get to a Freightliner shop.

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