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Yamaha Outboard Gauge Problem

Discussion in 'Technical Discussion' started by Globetrotter76, Aug 1, 2010.

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  1. Globetrotter76

    Globetrotter76 New Member

    Joined:
    Oct 20, 2004
    Messages:
    47
    Location:
    Cape Town - South Africa
    Hi Ya folks, i have been browsing the forums on my topic but I am still not sure about my problem.

    I have a 100HP Yam, there are two digital Gauges mounted in the console.

    The one that shows fuel tank level/Batt State/ Boat Speed Etc seems to have a problem. It recently showed all info accurately and now the screen is totally blank. Every now and then it flashes on and off and blinks and then just goes off.

    I am assuming that this is a power problem to the Gauge and not a problem with any of the senders as then I would see info on the Gauge whereas it is totally dead no info for speed/batt charge or Fuel tanks level.

    I looked under the console and there are two Gauges(The other being Tachometer) wired into "common" wires which I am assuming go to the start switch and battery, there are two more wires which are not common which I am assuming go to the fuel tank sender.

    Anyways I inspected all the wiring that is common between the two gauges and there is a black wire which I dissconnect from the working gauge and it loses display to the working gauge, I am assuming that this is the power supply wire, however the non working gauge is connected to this line(Common) and therefore should have power, but still there is no display at all on the LCD of the Fuel/Speed/Batt Gauge.

    Do you think I have a broken Gauge or should I look further?
    Any tips or hints on how to troubleshoot this further???

    Any info would be greatly appreciated.

    Regards

    Globe76
  2. Marmot

    Marmot Senior Member

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  3. Globetrotter76

    Globetrotter76 New Member

    Joined:
    Oct 20, 2004
    Messages:
    47
    Location:
    Cape Town - South Africa
    Thanks Marmot, that helps out nicely. Will look into it further when I get chance.

    I am still thinking that the gauge is the culprit.
  4. NYCAP123

    NYCAP123 Senior Member

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    Mar 14, 2008
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    11,094
    Location:
    Long Island, NY
    Have you tried switching the wires from the working gauge to the non-working one to see if it is the gauge or maybe just a bad connection?
  5. Globetrotter76

    Globetrotter76 New Member

    Joined:
    Oct 20, 2004
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    Location:
    Cape Town - South Africa
    The wires from the working gauge and the wires from the non working gauge are linked to common wires going back to the switch.

    Check out the link with the wiring diagram that Marmot posted above.
  6. FullaFlava

    FullaFlava New Member

    Joined:
    Dec 4, 2009
    Messages:
    50
    Location:
    Fort Lauderdale
    Had a very similar problem on a round Yamaha Speedo/Fuel guage from a twin set

    Try removing the guage from the panel and turn it face down on a sheet of kitchen towel on a bench.

    Mine was full (really full) of water and required exchange; it had no external obvious dings marks, scratches or damage showing how the water could've got in.

    Any water inside will leak onto the kitchen towel. I didn't try to dismantle it or dry it out with dialectric as I had ordered a new guage anyway.
  7. Globetrotter76

    Globetrotter76 New Member

    Joined:
    Oct 20, 2004
    Messages:
    47
    Location:
    Cape Town - South Africa
    I will try that, we are busy now, so leaving it till I can order a spare part.
    But me thinks the gauge is the problem.

    Thanks for your thoughts