From: olsonm@tiny.invalid   
      
   Tom Del Rosso  wrote:   
   > The shop will have to start it again, so how long before that damages   
   > the battery or something?   
      
   Why would they _have_ to start it up?   
      
   I would remove the alternator, and test it on a bench setup   
   with a known good battery, both without load (except the fully   
   charged battery) and under some load. No need to start the car and   
   potentially damage lots of expensive electronics from overvoltage. If   
   the alternator tests bad, probably the internal regulator needs to   
   be replaced. If it tests good, I'd look to the wiring in the car,   
   especially ground straps/braids.   
      
   I would also question the health of the battery, I'm surprised that   
   the alternator was able to overdrive it to more than 19V.   
      
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