136 or 160 Amp Alternator - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 5 (permalink) Old 07-05-2009, 04:27 AM Thread Starter
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136 or 160 Amp Alternator

Trying to decide whether to order truck with the higher power alternator or not. May mount a cab over camper, and most have their own battery, but would like to add a couple more batteries to insure I don't run out of power with extended camping stops. I'm sure the 136 amp is pretty tough but I don't want to overwork it, charging beyond its design. Also with what starts to look like a bank of batteries, it might take forever to charge them all. Also want enough power to run some fairly bright floods sometimes, space heater, etc. Basically insure have bit more power than I need rather than the other way around.

On the other hand when I'm just around town without all the power needs I don't want an oversized accessory always robbing my fuel economy. Wish I knew what the tipping point was for the 136 amp alternator's capability limits and if there's a difference in mpg on 160 amp? Any ideas?
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post #2 of 5 (permalink) Old 07-05-2009, 05:53 AM
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A higher amp alternater will not change full economy just because it is larger. If the amp demand is lower thats all the alt will put out regardless of the size. Now if your demand is higher then 136 amps then it will put out more amps, if it is lower both alts will put out the same and use the same horsepower. Personally I prefer the larger just to have the extra reserve or are using the truck to jump start another engine and you need to charge the other battery some first.

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post #3 of 5 (permalink) Old 07-05-2009, 03:12 PM
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Another insight look is that later on when things wear out the higher amp alternator is harder to find and much more expensive to replace, just a thought from an old parts guy.....

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post #4 of 5 (permalink) Old 07-06-2009, 06:48 AM Thread Starter
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Thanks Dodgefarmer, that's the info I needed and we're thinking along the same "better safe than sorry" lines too. Though when I saw this example project it really made me figure I'd need the extra amperage if I went ahead with anything like it...
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post #5 of 5 (permalink) Old 07-06-2009, 07:08 AM Thread Starter
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BigRed, you're right about replacement cost but I figure if I actually need the extra juice, then I HAVE to buy it anyway. If when broke down in the outback needing a quick fix, and the usual supply chain only carries the regular unit... I should be able to put in the lower power unit temporarily - I THINK.

That's one of the headshakers when looking at the snow chief package - it says 750 amp heavy duty batt's and 160 amp alt. But as far as I can tell every 6.7 comes with 750 amp batteries, and the 160 amp alt is the only real upgrade. You happen to know if this is true? If so, the 136 amp unit would get me home as long as I wasn't trying to recharge a bank of additional batteries during that kind of "limp home" trip.
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