From: @.   
      
   On 5/9/2023 10:39 AM, Xeno wrote:   
   > On 9/5/2023 11:34 pm, 😎 Mighty Wannabe ✅ wrote:   
   >> 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.   
   >>   
   > Correction, the alternator output is DC. The 6 internal power diodes   
   > provide the necessary rectification. The 3 exciter diodes are meant to   
   > excite the field coils and set the generation process into gear.   
   >   
      
      
   Are you sure that's true for 1948 Pontiac?   
      
   Maybe that alternator had been modified to use external rectifiers and   
   regulator.   
      
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