Mr. Gary,
One more thing just came to mind.
My Campmobile has AC and I think any time AC is in machine large amp
alternator is what it needs.
I think that this is what parts book had in it.
Low amp no AC
Large amp AC
Does this sound right ?

Good Morning,
Fred

E-mail message

Fred,
��������I think the reason for going to a 90 amp
alternator was that the highspeed fan, lights, blower and charging needs
for a discharged battery(located a long way from the alternator) may be
too close to maximum output for a 65 amp alternator. � Most of the
time the output is below 10 amps so I would expect both alternators to
run cool but perhaps the added winding may make the 90 amp run a bit
hotter. This is assuming the wire guage is the same for the 90 amp and
65 amp. � The flow of electrons produce heat and the heat does damage
to the insulation on the wires. � I would expect that on the whole the
90 amp runs hotter than the 65 amp but the 90 amp is less likely to fail
when a heavy load is placed on it. I am just guessing on this. � What
failed on my alternator was the rear bearing. � I am guessing that was
from too tight of a belt. I intend to rebuilt this one for a spare to
replace the two year old napa replacement when it becomes unstable. gary

Mr Gary,
I believe all Westfalias have the 90 amp, which Is the case for me.
And you are right when you say it may not be what you think when you
buy.
They could be anything in amperage.
I did check this new one to be sure, and it is doing 92 amps.
I also think maybe this.
If a big amp alternator ( 90-- 125 ) will work less hard than smaller
one.
It will not run as much.
Because it charges faster.
I have two batteries, and need large output to get job done.
So I think I am looking for used alternator to have rebuilt by local man
who does nothig but rewind and redo these. I want maybe 125 amp.
Faster battery recovery in two battery machine. But I do know what you
say.
Less heat small alternator.
But if it work harder to do same as large one in short time, more heat.
Yes?
Good Morning,
Fred