I can think of a few possibilities:
1) There's a significant difference between the voltage on the alternator sense circuit and the battery
2) The alternator's current output is low (possible caused by damaged diodes from disconnecting the battery)
3) A shorted battery is drawing a lot of current and pulling the voltage down.
It could be a combination of these -- if the alternator's good, it would take an awful lot of current going to a shorted battery to pull the voltage down. This would create a huge amount of heat in the battery.
I'd have the battery and alternator both tested.
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Lee Peterson
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"I didn't expect a kind of Spanish Inquisition...!"
'69 Cameo White RA III Judge, 4 speed, owned since 1977 -- my first car.
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