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Thread: Temp Gauge

  1. #1
    Join Date
    Apr 2012

    Default Temp Gauge

    Hope you guys can help,

    the temp gauge is not reading anything...any advice on what to check?

    05 Moomba LSV

  2. #2
    Join Date
    Oct 2013
    Ft. Collins, CO


    Temperature sensors/gauges are pretty simple. There is a single wire connected to the sensor; check that to make sure it's secure. Then there is power and ground at the gauge; check both of those. The majority of the failures are in the wiring, most notably the ground connection. The actual sensor could have failed but that's much less likely, in my experience.

    I don't know what the thermostat/temp sensor housing looks like on an 05 LSV. On older 350 marine engines the housing was separated from the engine block by a thermostat gasket. You had to use a special gasket (non-automotive) that had little conductive beads in it to make a ground reference connection for the sensor. I don't think this is a concern in the more recent motors but I don't know for yours.
    2007 Mobius LSV
    1989 Sanger Skier DX - sold

  3. #3
    Join Date
    Jan 2014
    Newberg, OR


    This happened to my boat on it's second time in the water. AWS replaced the thermostat and gauge is functioning normally now.

    sent from my S4 using Tapatalk
    2014 Moomba Mondo - Exile Tower/Sub/ZLD/EXBT4/Amps (2x), Hertz Cabin - Evolution Cover - 650 IBS, 900s Rear, Center Hard Tank, Flow
    1969 Bayliner Tahiti - 120 HP Force Outboard - Gone but not forgotten

  4. #4
    Join Date
    May 2013


    There are two sensors. The one on top of the intake manifold is for the computer and the one next to the water pump is for the gauge. If you ground it the gauge should peg. If it doesn't then you know your problem isn't with the sensor. My issue was with the large pin connector under the ending circuit breaker. The connection was bad.

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