HELP! type 44 5k/100/200 wierdness

[JordanVw at aol.com]

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last night (hot here in PA), i pulled into a gas station with my '86 5kT -
euro lights on, a/c on, fan running hurricane speed. shut the car off, went
inside, afterrun fan running on high. nothing seemed amiss. came back out a
few mins later, got in the car, started it up - and it cranked over
slowly..but started up..  dash lights were dim,  VOLT warning light came in
in the autocheck display, and car started running rough, and was belching out
smoke out of the exhaust like crazy..  the climate control LED display lights
were flickering on and off, and then the car stalled out. i tried to crank it
up again, but clickclick nothing. no juice.  the battery is fine, its only 8
months old, group 41 700cca.   luckily i had my jumper booster pack with me
and i jumped the battery and the car started up, but dash lights were still
dim, VOLT warning light on, and climate control display going haywire and the
low amperage making the ECU go crazy (im assuming) thats why the fuel mixture
was off and the car was belching smoke from the exhaust still..  the rad fan
is on this whole time (car is hot) and when i turn the a/c off and the
headlights off, the car runs better, stops blowing smoke, and VOLT light goes
out after i rev the RPM's up..
my alternator is a year old Bosch reman 90amp...and ive had my eurolights in
for a year now, running the 80/100w bulbs, and never had a prob.  what do you
think the problem is?  a bad voltage regulator on the alternator?  wiring
problem??  the battery is fine.  can i move up to a 115 or 120 amp altenator?
 is there one available for the 5kt? dealer sez only 90amp was available for
that car.   any help appreciated, this charging system prob is driving me
crazy and im tired of being stranded....
thanks in advance
chris
'86 5kT
pa (supposed to be 105 degrees tomorrow)