[artart]

Just fired my Spider back up after adding a CD Changer and amp, new battery and new top! While I was wiring up the sound stuff and in the process of disconnecting the old battery I accidently caught the positive side into the trunk , slight spark no biggie (I thought)
During my checkout of the sound sytem completion noticed that the battery would not take a charge so I swapped it out,cleaned the ground while I was swapping to the new battery. Everthing starts and runs well getting ready to take it to the convention tommorrow and ran a shakedown run tonight. Immediately noticed a low glow on the charging idiot light, then checked to see the voltage meter reading below 12! Previously read just above 12. Ran around for 15 minutes and noticed that at idle meter reads right at 12, on takeoff the light glows brighter and the oil and brake lights are coming on as well, get to crusing speed they go off, still a slight glow on the charging light.
As an American shade tree mechanic we always tested alternator for output by pulling the positive cable off the battery while the engine is running, if the motor stalls you know their is no charging going on. Can you do the same for the Alfa? I have a multimeter, is there a way to check the alternator while running?
Trying to start the drive to Ft. Lauderdale by mid morning so I'm looking for help tonight.
Thanks artart