That surprised the crap out of me too. My Jeep engine has 100% of it's
torque at around 1750 rpm and is a real strong runner climbing sand pit
walls down to 400 rpm. It won't stall.

The alternator is just a new remanufactured GM 'one wire' (3 wires
actually) 70 amp unit I think with an Optima battery. My Warn HS9000i
winch on full load doesn't drop my rpm like that unless I stall it and
and that stall is a rated 450 amp draw.

The only time I have seen that in the past was trying to boost a battery
and start a vehicle with a dead cell if I remember right....

Even with no draw, when I hooked up the booster cables the rpm took
about a 100 hit.

I do have heavy gauge booster cables with good clamps

Mike

ottertailfamily wrote:
>
> What the heck have you got for an alternator that will drop your engine 1200
> rpm? Man that must suck a LOT of power from the engine, or your engine
> doesn't produce much torque at 1200 rpm. I would guess a normal alternator
> would take at most 3 hp to turn, especially at such a low rpm.
> tad
>
> "Mike Romain" > wrote in message
> ...
> > He checked at the pump on those wires and had the same 10+ volts.
> >
> > Do you think this is enough to spin it up?
> >
> > I am thinking a lack of amps as well with a weak battery cell. The
> > charger does boil one cell harder than the rest and that one was low on
> > water. I tried boosting and it sucked my new alternator and new battery
> > hard enough to drop me from 2000 rpm on a hand throttle down to 800
> > rpm. Serious draw.
> >
> > Mike
> > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > 88 Cherokee 235 BFG AT's
> >
> > oilyspill wrote:
> >>
> >> I believe there is a dark green wire with black tracer at the pump
> >> relay. That's the main power wire for the pump. It should be hot when
> >> cranking. Is it? You may have an initial prime for a few seconds, with
> >> the key in the on position, engine not cranking. After that, the
> >> computor will kill it, unless there is an rpm signal, you can't get a
> >> rpm signal without cranking the engine. If it is hot at the relay,
> >> check it at the pump plug, if that's ok, check the ground. If it will
> >> spin with B+ and a ground outside the vehicle, it should do the same
> >> thing on the vehicle. hmm