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Old 02-15-2010, 11:56 AM   #1
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Lisle , Illinois
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The alternator is going out on my new TV 1994 C2500 Suburban.

I have a decision to make, to I go with a stock 105 amp unit or upgrade to the 140 amp alternator? With two batteries on the truck and than adding a third while towing, do I need the extra 35 amps?????

Thanks in advance.....

Tedd Ill
AIR#3788 TAC IL-10
1967/8 Overlander International Twin w/ bunk/s.
Yes, four kids and two adults in the thing.
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Old 02-15-2010, 12:21 PM   #2
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2010 30' Classic
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South of the river , Minnesota
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The performance on the overwound units isn't that great.

You might, on the other hand, consider a CS-144 upgrade. It's a larger frame alternator that produces more output, especially at idle. You might need a different belt and there is a wiring adapter you use because the connector is a little different.

GM CS-144 High Amp Alternators, Nations Power Engineering

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Old 02-15-2010, 12:34 PM   #3
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Unless you are doing a lot of stop and start, less than 30 miles per start, you do not have enough load to warrant the large alternator.
2004 Excursion 4x4
1991 34 ft. Excella +220,000 miles, new laminated flooring, new upholstery, new 3200 lbs axles

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