Yamaha outboard temp sensor

Yamaha outboard temp sensor DEFAULT

Hopefully there is a really experienced expert Yamaha mechanic out there who can help. This is a total pain. My with twin 4 strokes has an intermittent overheat alarm (on both engines) that goes off intermittently and only when putting the throttle forward (or reverse) from idle. To date, my mechanic has replaced.. impeller pumps, impeller housings, thermostats, filters on engine, just put in diodes under the dash (from Japan.) fuel water separators and engine temperature sensors. The diodes were replaced because he found low power to the dash which they helped that but I still have the alarm issue. The readouts on his lap top show no actual temperature issues. The engine temp sensors were replaced as a bit more of a preventative maintenance and to rule them out. This is a real pain.. as it usually happens when docking or putting the boat on the trailer. Also, it happens on both engines, not just one, whenever it feels like it.. To stop the noisy alarm i have to shut off the engine and restart. That stops it.. until it intermittently decides to do it again..

Any advice or help would be appreciated. I live in San Diego.

thanks
Doug

 

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  1. ,  PM#1
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    what color is the yamaha temp sender wire?

    I just swapped a mercury for a Yamaha and want to hook up the old mercury temperature guage to the yamaha. I know the Mercury temp sender wire was tan. What is the yamaha's? I looked in the wire color code and don't see one. I see a thermo sensor wire and that black/yellow but it doesn't go to the key switch. There is a Tan wire at the key is that the one?

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    yes same color it should have a blue tracer on it

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    The tan wire has no blue tracer, there is a blue wire. So the tan one is the temp sender then? I wonder why its not listed that way in the color codes.

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    no sorry thought you needed the color for mercury the thermo sensor wire is the one your lookng for and it would not go to key switch, it goes to the gauge.
    sorry for the misunderstanding your question i can check tomorrow for you for sure and post it

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    I see the thermo sensor wire its black w/yellow stripe. I tried following where it goes. all I know is it does not go out of the engine. There is a whole mess of wires coming out but non of them are that black w/yellow. If you can tell me what color is the one to hook to my temp gauge it would be very helpful.

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    Still looking for the answer.

  7. ,  AM#7
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    PINK is for the alarm, the heat and oil sensors route to the pink.

  8. Quote Originally Posted by ucf_motorcycleView Post
    Still looking for the answer.
    To run a temp gauge you need to install a temp sender on the motor and run a harness from the temp sender forward. The one that is used for the warning system is just for the alarm (I believe it's an on/off kinda deal).
    '08 SRV
    Yamaha Phase III


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    I missed the temp GUAGE part, yea, completely separate system. Have to do it all from scratch.

  10. ,  PM#10
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    So the temp sensor that is on there now is just an on/off then? I guess Yamaha doesn't think temp is important to monitor. I suppose with an overheat alarm its good enough. Just wish I didn't have a dead gauge in my console now.

  11. Quote Originally Posted by ucf_motorcycleView Post
    So the temp sensor that is on there now is just an on/off then? I guess Yamaha doesn't think temp is important to monitor. I suppose with an overheat alarm its good enough. Just wish I didn't have a dead gauge in my console now.
    The engine is designed to work with the two digital gaugeswhich monitor everything but only give you a warning light and alarm. If you want a separate water temp or pressure you have to install the appropriate sendersit's not really a big deal.
    '08 SRV
    Yamaha Phase III


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