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Gary H 1978 911 SC
Join Date: Oct 2003
Location: Fort Worth Texas
Posts: 1,306
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Cessna ignition switch
My 54 C170 ignition switch lost a mag check function and had key wobble like a worn 915. The new switch A510-2 has a diode for the start relay to ground. Question is the old switch did not have a diode so is it necessary?
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