I have installed a new unit to replace a worn out alternator, during flight the alternator will drop off line but cycling the switch will reset it every time. What can be done to eliminate this?
Check the voltage drop in the field circuit. If the voltage differential between the airframe buss and the field terminal is more than 1/2 volt you probably have a bad field circuit breaker, bad alternator switch, bad wiring connections or a combination of the three. Note: The average airplane age is in excess of twenty years and few have had the circuit breakers replaced, corrosion, using the breaker as a switch, and moist conditions tend to allow the contact points of the breaker to acquire resistance, which in turn will change the voltage and current values in the airplane’s electrical system.
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