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alternator knocked off line when strobes turned on

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sttwig

Joined: 26 Aug 2007
Posts: 31
Location: Yakima, WA

Posted: Tue Sep 16, 2014 12:09 pm Post subject: alternator knocked off line when strobes turned on

Good day,



When my strobes are turned on, after two or three seconds the alternator 

goes off line.  I can turn the strobe switch off, recycle the master 

switch and the alternator comes back on line.  With the strobes off, I 

can load the electrical system clear up to fifty amps with the landing 

light, nav. lights, pitot heat, etc. and the alternator won't go off 

line.  When the alternator goes off line with the strobes on, the 

strobes continue to operate off the battery.  This behavior just started.



The aircraft is an older Super Cub.  The only instrumentation in the 

electrical system is an ammeter on the alternator output.  I cannot find 

a breaker in the field circuit.  The alternator is an InterAv (Motorola) 

and the voltage regulator appears to be a Motorola.  The strobes are 

Whelan.



Any thoughts are appreciated.  Thank you,



Steve S.



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