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

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   Message 117,330 of 117,728   
   Paul in Houston TX to Ivan Vegvary   
   Re: One wire alternator question   
   09 May 23 17:44:57   
   
   From: Paul@Houston.Texas   
      
   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   
      
   There must be current... but not a whole lot.   
   Possible corrosion... some where.   
   the alternator wire at alt or batt.   
   alt slip rings corroded.   
   alt brushes stuck.   
   internal corrosion at the diode plates.   
   bad alt ground.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)   

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