From: @.   
      
   On 5/8/2023 11:58 PM, Ivan Vegvary wrote:   
   > 1948 Pontiac, 12V battery, one wire alternator (was working when parked 12   
   years ago).   
   > No amperage reading even at 2000 rpm.  Battery voltage 12.6V.  Battery   
   voltage with car running 13.8V, however amp meter only reads 0 or negative   
   with headlights on.  Placed an after market ammeter between the alternator and   
   the battery.  Same reading    
   as ammeter in the dash.   
   > How could this be?  Alternator supplies voltage but no current.   
   > After idle for 12 years maybe residual magnetism is gone.  Needs to be   
   excited.  Can't find a YouTube that shows me which terminals to zap.   
   > All help is appreciated.  I can certainly buy a new unit, but possibly have   
   other problems.   
   >   
   > Thank you   
      
   If you get 13.8V when the car is running, that means the alternator is   
   providing output.   
      
   The alternator output is AC. You need to use AC ammeter to measure the   
   AC current output from the alternator.   
      
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