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   rec.autos.tech      Technical aspects of automobiles, et. al      117,728 messages   

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   Message 116,496 of 117,728   
   Mark Olson to Tom Del Rosso   
   Re: Alternator at 20 volts   
   06 Feb 22 16:14:27   
   
   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.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)   

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