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I wish I knew how much I need. I will have 4 starting batteries and up to 6 deep cycle batteries for the Camper. Any idea what size alternator would be right for that application? I can always sell the 400 AMP unit, and even makes some money on it, and buy a smaller one (once I know what size...

Before we get crazy here with this alternator project, let me ask a question. What size alternator do i need to feed 4 batteries for starting and cab electronics and 6 deep cycle batteries for the Camper portion?

If I remember the spec's on it, it is supposed to put out over 200 AMP at idle speed. I think it was part of the requirement from the military that it could produce over 200 at idle so they could run the equipment in the HMMWV .

I do appreciate your contribution to the conversation. I am still in the early stage of my build. I may have jumped the gun on getting the 400 AMP alternator. I was assuming it would only put as much resistance to the engine as demand rose. So if i was not pulling 400 amps it would not put...

I might have to reconsider my mod. Since it is not a critical part of my RV mod I will hold off doing the project until i have more info available. I would like to get real data on the alternator, such as HP used in idle, and whether it puts an increasing load on the engine as power demand...

Thanks for the correction. So I guess I will have to set up all the batteries in 24 Volt groups and use a battery equalizer or inverter to get 12 volts out for the camper.

50 AMP output at 12 volts should be enough to recharge a 4 battery bank. 60 AMP alternators already do it on most of out trucks.

I just found some more info on the alternator and wanted to share it.

Found the following info in a document on the internet: "ALTERNATOR (400 AMPERE) – Is rated at 28 volts at 400 amperes and 14 volts at 50 amperes with external regulator. The alternator assists and recharges the vehicle batteries during operation."

Doesn't the truck have to be in neutral for the PTO to be used? Or the transfer case has to be in Neutral.

The difference is that I can charge the battery bank while driving. Whereas the PTO driven generator will need to run when the truck is parked. I can still charge the battery bank while parked as well.

Have no idea. Might be 200 amp 24 volt and 200 amp 12 volts.

Here is a parts breakdown of the entire assembly:

Cool! I just thought the picture was interesting -since I never seen the inside of that housing.

I found an interesting picture of the entire housing that I am attaching. There is a brand new #4 available on an internet popular site.

As long as both engines rotate in the same direction we should be good there. Main issue is getting the cooling system components out of the way.

Just to clarify the part names I looked them up in the TM. I did not think the engine had a built-in coolant filter. According to the TM the part you are referring to is an engine oil cooler #4 on the drawing. I am attaching the scanned image of the page to make it easier to identify.

Does not matter. We are discussing installing a 400 AMP alternator in it's place. Only reasons are: It's dual voltage, the price was great. Could not find the 200 AMP version at a reasonable price. Did not realize it was that big. Was told it would fit. Wanted a way to charge up the 12...

As long as the HMMWV engine turns the same direction as the NHC250 we should be OK with the turning direction! As far as the pulley, they are removable and replaceable with a 2 V-belt pulley. Any good alternator shop will be able to swap them out.

You can also move the red hose seen in pictures 1 and 2 by switching the hoses that come out of the transmission oil cooler.