Originally Posted by
Pilot DAR
I don't entirely understand either, the loadmeter showed it charging in the green during the pre takeoff check, neither of us gave it more than normal thought, as we did not realize yet that there had bee a malfunction...
With a reverse current relay failure, as long as the starter/generator is up to speed, the current flowing from the generator will energize the main power buss above battery voltage. When the engine is shutdown, and the generator goes below the rpm needed to generate current, current will flow from the battery thru the generator windings, which spins the starter/generator. In the 369, the generator is controlled by the switch function of the reverse current relay, not by controlling the field circuit.
Turning off the master switch will disconnect the battery from the reverse current relay.
Putting a shunt in the starter wire will not identify this type of failure, because current flow thru the generator circuit is causing the problem...