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B+C alternator problem

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James Baldwin

Joined: 16 Jan 2006
Posts: 23

Posted: Sat Oct 04, 2008 8:10 am Post subject: B+C alternator problem

Bob (and anyone using the LR-3 regulator),  

   

Before taking any drastic action like removing or replacing the LR3B regulator I downloaded the troubleshooting guide from B+C.  With my new DVM I performed all of the suggested measurements and found the regulator to be doing as it should, no abnormalities.  I called Bill at B+C and asked about the PTT (push to test) switch shown connected to pin 2 and what it did.  It shorts pin 6 right to ground internally for the OV test.  He suggested that the switch really wasn’t needed and had given some problems to others in the past.  In my case it was the intermittent switch that was blowing fuses no matter which value.  So, if you have any problems with blowing the fuse or C/B shown connected to the alternator field circuit this might be a factor.  Thanks to Bob for helping, the airplane is back in the air.  JBB   

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