Hmmwv 400 amp alternator conversion from 210 amp

[Titanite92]

I'm looking to convert my 1097r1 from a 210 amp generator to a 400 amp. What bracketry will be required? It should fit without modifying the power steering reservoir correct? Thanks all!

 

[Coug]

Shouldn't be changes to PS reservoir or anything else that I know of.
Main thing is the routing of the wire harness past the alternator. With the 400 amp it tends to rub on the alt, and get damaged.

Biggest question is, why?
Seriously. I've never actually heard of anyone wanting to go to the 400 when they already have a 200. It's almost always the other way around.
The 400 amp is huge, heavy, blocks off that whole side of the engine making access to the fuel filter extremely difficult. It adds stress to the serpentine belt, and throws off the reading of the tachometer.

EDIT: which version of the M1097R1 do you have? Is it the 3 speed truck or the 4 speed?

 

[Titanite92]

Shouldn't be changes to PS reservoir or anything else that I know of.
Main thing is the routing of the wire harness past the alternator. With the 400 amp it tends to rub on the alt, and get damaged.

Biggest question is, why?
Seriously. I've never actually heard of anyone wanting to go to the 400 when they already have a 200. It's almost always the other way around.
The 400 amp is huge, heavy, blocks off that whole side of the engine making access to the fuel filter extremely difficult. It adds stress to the serpentine belt, and throws off the reading of the tachometer.

EDIT: which version of the M1097R1 do you have? Is it the 3 speed truck or the 4 speed?

4 speed truck, and okay makes sense. Long story short, my HMMWV is highly modified, with multiple winches and set up with 4 batteries for recoveries, the 400 amp gives me a bit more leeway in winch time etc without having to worry about batteries is the primary idea

 

[Coug]

If you are running the winches hard enough for the battery recharging to be an issue, then maybe look at the Milemarker Hydraulic winches instead.
100% duty cycle, so you can run them nonstop all day long, as long as the engine is running.

Have you actually run into real life situation where the current system is unable to keep up with your winching?

200 amps is a lot of current to begin with. If you are running 24V winches there aren't many out there sized for the HMMWV's capabilities that are going to exceed that, and most electric winches have a short enough duty cycle to not be an issue.
You do need to use the throttle lock under the dash to increase RPMs for the additional output though.

 

[Titanite92]

If you are running the winches hard enough for the battery recharging to be an issue, then maybe look at the Milemarker Hydraulic winches instead.
100% duty cycle, so you can run them nonstop all day long, as long as the engine is running.

Have you actually run into real life situation where the current system is unable to keep up with your winching?

200 amps is a lot of current to begin with. If you are running 24V winches there aren't many out there sized for the HMMWV's capabilities that are going to exceed that, and most electric winches have a short enough duty cycle to not be an issue.
You do need to use the throttle lock under the dash to increase RPMs for the additional output though.

Absolutely, and no not this far, but I like to build in a safety net! Lol. I considered hydraulic but it makes the system as a whole more complicated, and not having availability of a PTO is a big downside. For reference, there are 7 winches on this rig, that's a lot of hydraulic hoses/capacity. Electric just felt like I was cutting out the middle man.

 

[Titanite92]

Absolutely, and no not this far, but I like to build in a safety net! Lol. I considered hydraulic but it makes the system as a whole more complicated, and not having availability of a PTO is a big downside. For reference, there are 7 winches on this rig, that's a lot of hydraulic hoses/capacity. Electric just felt like I was cutting out the middle man.

The duty cycle is nice, just haven't found a way to work it in a way I felt reasonable.

 

[Mogman]

Absolutely, and no not this far, but I like to build in a safety net! Lol. I considered hydraulic but it makes the system as a whole more complicated, and not having availability of a PTO is a big downside. For reference, there are 7 winches on this rig, that's a lot of hydraulic hoses/capacity. Electric just felt like I was cutting out the middle man.

PICTURES!!

 

[frauhansen]

I'm not necessarily THE expert when it comes to charging batteries. But have you checked how much load your batteries can actually handle? I don't think the alternator is the limiting factor here for charging.

And yes, hydraulic winches are not necessarily alternatives to electric ones. I deliberately decided against the hydraulic solution at the time because it also requires the engine to be running!

 

[65grendel]

I'd consider trading you my 400 amp for your 200 amp if your interested.

 

[TOBASH]

Most people swap the other way. The 400 amp is large and cumbersome and even causes issues for some people. It requires different brackets. It is a PIA

I strongly suggest you remain pat.

 

[Retiredwarhorses]

the 200amp bracket would need mods, you typically can convert from 400 to a 200amp easily, not the other way around.
the front and rear mounting ears are the issue…there is a 3/4in difference, you need to trim off 3/4in of the rear mount where the
the lomg bolt mounts through.