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3 Answers

Battery Won’t Shut Down!

Asked by: 1928 views Aircraft Systems

How would you troubleshoot the problem of an airplane battery not shutting down when the battery master is turned to the off position with keys removed?

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3 Answers

  1. Best Answer

    John D Collins on Dec 11, 2013

    This is usually a very simple circuit involving a battery master switch that provides a ground to the solenoid of the battery relay. Get a circuit diagram specific to your ship. It should be easy to troubleshoot. Below is a generic troubleshooting approach to this kind of problem, it may or may not match your aircraft wiring.

    Remove the battery lead from the positive side of the battery. With the switch in the off position there should not be a ground on solenoid. If there is, find the short to ground, It can be in the wiring to the battery master switch or in the switch itself. If there isn’t a ground on the solenoid, then between the two large connectors that the relay connects together should be open without any power applied. If there is a short, the problem is likely a failed battery master relay.

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  2. David M. Bishop on Dec 11, 2013

    Thanks for the answer! Have a merry Christmas!

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  3. David M. Bishop on Dec 11, 2013

    Oops. I meant to give you a positive vote. :-/

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