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Already planning to install the batteries along with fresh water tank and other items under the bed. Batteries will be vented to the outside.

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.

Thank you for the helpful suggestions. Actually the Fridge is on the Feet side of the bed. Also I still have to decide where to put the water heater, batteries, fresh water tank and pump. The black water tank will either go directly under the toilet or under the fridge area. (or both)...

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.

60 amp

I've been working at it all day and came up with a layout for the camper. It may change or get upgraded as I get into details. Here it is:

Glad to! The water heater is a suburban 6 gal, these units are common and come in a few different configurations , electronic ignition, lp and optional electric heating rod ect. The pump I used Is a sureflo 2.9 gpm, it seems to work well. I typed in rv parts on ebay and thers tons of parts...

I assume you did not install them on the NHC250 yet. So we are both hoping they will fit somehow?

Any ideas are welcome at this point. I will post some closeup pictures of the alternator tomorrow. I don't think the mounting is going to be as much of an issue as the space required. BTW the newest part on the Alternator is dated April of 2010 -so it is not that old of a unit.

Someone just asked that question of me a few weeks ago! Wire the 2 batteries in Series Use the longer bridge cable to connect the + to the - between the 2 batteries. The other unused + and - terminals are where you connect the chassis ground and + going to the starter. There are also some...