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Thread: sudden drop in volts from 14.4 to 1

  1. #1
    Senior Member
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    Mar 2010
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    gilford, nh
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    sudden drop in volts from 14.4 to 1

    I have a 4500 and after landing pulling into the hangar I got a check volts message and noted my volts was reading 1.
    Any ideas what could cause this? If I lost the alternator or the belt it should have dropped to the battery voltage not 1 volt
    See my data. It happened at 29 minutes into the flight(volts in yellow)Name:  Screen Shot 2014-11-23 at 5.19.13 PM.jpg
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  2. #2
    Have you checked the power going to the EFIS with a volt meter?

    Fuse, circuit breaker, master switch?
    Rob Hickman
    Advanced Flight Systems Inc.

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