The OP sent me a private email. He indicated that there are two continuous
duty contactors, only one used at a time. Which ever one is energized will
carry starter current and aircraft load. He said the engine cranks just fine.
I assume there is a separate starter contactor. I do not have a schematic. He
measured the voltage drop across each continuous duty contactor when it was
independently energized. He measured 0.82v across one contactor and 0.42v
across the other contactor with the voltmeter probes on each large stud and
with the contactor energized.
I suggested that he turn each contactor on and off 100 times in an attempt to
wear away any contact oxidation, then repeat the voltage measurements.
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Joe Gores
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http://forums.matronics.com/viewtopic.php?p=516721#516721
