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Old 09-30-2016, 09:11 AM   #1
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Alternator Upgrade options?

Hello everyone
What are the alternator upgrade options for my 05 Ram?

After installing an electric cooling fan, I think I need an upgrade

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Old 09-30-2016, 09:22 AM   #2
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The fully loaded Durango alternator is as big as they come and should be more than enough.
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Old 09-30-2016, 09:43 AM   #3
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Durango of the same year?
does it bolt in? or does it need modding?
By the way do you know how many amp the stock alternator is?
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Old 09-30-2016, 10:50 AM   #4
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Yes the 2005 Durango alternator for the 5.7 is the same size and what not just has two options. Stock truck is 105/115 I believe and the Durango is 130/140 range.
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Old 09-30-2016, 12:33 PM   #5
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Max, just an input. I've run a efan and normally have the fogs turned on for driving along with a 400lph fuel pump while using a 20% under drive and not had any issues. I've since removed the under drive pulley and have added a intercooler circulation pump with no issues. Point I'm trying to make is are you sure you need to run a higher output alternator? I don't know the hp difference is but it has to be some loss. Now if you had electric power steering and water pump it might be needed. Waste not, want not... lol
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Old 09-30-2016, 03:38 PM   #6
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Quote:
Originally Posted by charged392 View Post
The fully loaded Durango alternator is as big as they come and should be more than enough.
---------------------------------------
Is it truly a plug-n-play swap for the '05 Hemi Ram...if not could you please provide any necessary modifications with pics .
Thanks
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Old 09-30-2016, 03:41 PM   #7
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it is just that this morning I had the headlights, wipers, radio, and heater fan on and when the cooling fan came on I noticed the volt gauge drop at idle and felt the heater fan slow down a little bit. When driving it is not a problem.

It's funny you mentioned the pulley as I just noticed that I have a 6rib crank pulley (and drivebelt) every accessory is 7rib; so now I wonder why would the previous owner put a 6rib crank pulley? Could it be from a 5.7hemi car?
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Old 09-30-2016, 04:52 PM   #8
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Strange, I didn't think the car pulley would interchange. But don't know.
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Old 09-30-2016, 05:15 PM   #9
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It might not be a bad idea to load test the battery. A weak battery can exhibit the same symptoms by requiring more current to charge.

For what it's worth my '11 2500 has a heavy duty alternator as part of the snow plow prep package. If the '05 2500 had that option too that might be what you need.

As for power loss, nope. The amount of power required to turn the alternator comes from the load. Charging the same amps a heavier duty alternator will be real close to the same drag assuming the bearings are good.
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Old 09-30-2016, 08:29 PM   #10
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The 6rib is likely from the jeep setup. The car pulley will not for at all on the truck its to short for stick out wise.
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