Water Temp Gauge
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Water Temp Gauge

  1. #1
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    Default Water Temp Gauge

    So I think my water temp gauge is not working. Is there a way to determine if it is the gauge or the sending unit without just replacing one or the other? I am guessing somewhere between 160 and 180 at cruising speeds is a normal temp. I would also expect it to rise while slowed down to idle. My temp gauge never reads over 130...therefore i assumed it was no good. But then I thought maybe it could be the sending unit????
    Sold the miller...bought an open bow Kachina!!

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    Senior Member jetboatperformance's Avatar
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    Quote Originally Posted by 83miller View Post
    So I think my water temp gauge is not working. Is there a way to determine if it is the gauge or the sending unit without just replacing one or the other? I am guessing somewhere between 160 and 180 at cruising speeds is a normal temp. I would also expect it to rise while slowed down to idle. My temp gauge never reads over 130...therefore i assumed it was no good. But then I thought maybe it could be the sending unit????
    Jets tend to run cold 120/130 would not surpize me at all Tom

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    Boat Nut sleekcrafter's Avatar
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    simple test of the gauge..... (Key-on) ground the water sender post to ground. If the gauge pegs you have a bad sender or wire. If the wire is suspect do the same, but ground the "S" teminal on the gauge. If the gauge does not move, check for voltage to the "I" terminal. If power is present, and grounding the sender, or "S" terminal does not move the guage, you have a bad gauge.
    Upper Midwest Power Boat Association
    DRAG BOAT RACING UMPBA #926


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  6. #4
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    Quote Originally Posted by 83miller View Post
    ...My temp gauge never reads over 130...therefore i assumed it was no good.....
    Before you spend much time or money tracking down a problem, make sure you actually have a problem. Get ahold of an infrared thermometer and see what temp the engine is running. As Tom says, jets tend to run cold and your gauge may be telling you the truth.

    Doug

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