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  1. #1
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    Jun 2009
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    Lake Martin, Al.
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    25

    Battery Master Power Switch

    Has anyone experienced the battery master cut off switch causing a voltage drop as it ages?

  2. 165 Custom Baits Hair Jig's Avatar
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    Sep 2004
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    Weatherford,TX by way of Chattanooga, TN
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    4,245
    #2
    Not likely the switch but rather the connections. Check for rust and corrosion.

  3. Member
    Join Date
    Jul 2017
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    Lower, Alabamer
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    449
    #3
    Quote Originally Posted by Hair Jig View Post
    Not likely the switch but rather the connections. Check for rust and corrosion.
    ^^^This...and undersized wiring that's finally catching up.

  4. Member
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    Sep 2018
    Location
    St.George Utah
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    83
    #4
    Yes, ive seen all sorts of switches, solenoids, relays, etc wear out do to age/corrosion/burnt contact points. If im troubleshooting a electrical problem like yours i usually do all wiring, connectors, switches, and junctions in that system.

  5. Member
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    Jun 2009
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    Lake Martin, Al.
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    25
    #5
    Thanks for your responses.

  6. Member
    Join Date
    Feb 2008
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    Living the good life on Lake Hartwell, Fair Play, SC
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    6,909
    #6
    It may not necessarily be an "age" related condition, but rather in some cases an overload situation. I had a Blue Seas battery shut off in my boat from new and it was marginally rated for the total amps of the equipment I had plus an outboard that was a 2.5 Liter 225 ProMax. Over the years I replaced the 2.5L with a 3.2L 300XS and added all kind of electronics etc. til I found myself in a situation that my battery was run down just enough that my low voltage alarm would sound on initial startup. After that all day it was fine.

    There is a rating stamped on the back of the shut off switch. I tested the Voltage at the cranking battery then tested the voltage at the outboard and it was over a volt lower. That's significant. I also tested voltage on other electronics after the main shut off and found similar readings. I replaced that shut off with a higher rated amp switch and ran my outboard battery cable direct to the cranking battery. The outboards today need high amp cranking batteries

    This is the one I use now, but I have also added a house battery dedicated for my electronics
    https://www.bluesea.com/products/300...Battery_Switch
    2013 Allison XB-21 BasSport Pro
    2023 Mercury Racing 300R
    Bravo FS 30P
    ProMax 30P

  7. Member bigbitef11's Avatar
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    Feb 2014
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    mitchell, sd
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    556
    #7
    I've had to clean mine of corrosion when I've lost power

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