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