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07-20-2012, 02:14 PM
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#1
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Junior Member
Join Date: Jul 2012
Location: Glen Ivy, Ca
Posts: 20
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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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07-20-2012, 02:38 PM
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#2
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Registered User
Join Date: Feb 2008
Posts: 3,607
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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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07-20-2012, 03:01 PM
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#3
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Senior Member
Join Date: Nov 2011
Location: Full time RV'er
Posts: 4,879
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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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07-20-2012, 06:29 PM
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#4
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Senior Member
Join Date: Feb 2012
Location: Aiken,SC
Posts: 1,025
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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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Good Sam Life Members
Served in U.S.A.F.
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07-20-2012, 06:55 PM
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#5
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Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 30,462
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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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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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07-20-2012, 06:59 PM
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#6
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Moderator Emeritus
Join Date: Jan 2007
Location: Litchfield Park, Arizona
Posts: 10,530
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Mine died at 4 years/40,000 miles.
Rick
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Rick, Nancy, Peanut & Lola our Westie Dogs & Bailey the Sheltie.
2007 Itasca Ellipse 40FD
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07-20-2012, 07:37 PM
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#7
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Senior Member
New Horizons Owners Club
Join Date: Oct 2010
Posts: 203
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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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Happy trails,
The Sundowners:
Jane and Chauncey, Plus the Cats: Backslash, EB, Stripes
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07-20-2012, 07:52 PM
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#8
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Senior Member
Join Date: May 2011
Posts: 459
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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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'05 Monaco Beaver 400 Quad SLD 400hp C-9 Caterpillar
2014 Grand Cherokee, Limited, diesel
Katie-Doberman Pinscher, Tigger, yellow Tabbycat.
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07-24-2012, 05:20 PM
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#9
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Senior Member
Country Coach Owners Club
Join Date: Jan 2006
Location: Northern California
Posts: 5,794
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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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Dean
1995 38' CC Magna #5280 ****Sold 21 years of fun
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07-24-2012, 05:27 PM
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#10
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Moderator Emeritus
Join Date: Jan 2007
Location: Litchfield Park, Arizona
Posts: 10,530
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Quote:
Originally Posted by deandec
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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Good advice. Running the generator got me several hundred miles until I could get to a Freightliner shop.
Rick
__________________
Rick, Nancy, Peanut & Lola our Westie Dogs & Bailey the Sheltie.
2007 Itasca Ellipse 40FD
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