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02 F225 Yamaha Round Fuel Mgmt Gauge - Trip Fuel Memory Resets when key turned off

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  • 02 F225 Yamaha Round Fuel Mgmt Gauge - Trip Fuel Memory Resets when key turned off

    I've been searching and going through schematics, and I can't find any really good info on these Fuel Management gauges aside from a basic wiring schematic and operating instructions. They are the round ones on non-networked engines for my '02 F225s

    The wiring diagram I have shows a red wire with constant 12V, and I am getting 12V constant
    The wiring diagram I have shows a yellow wire with 12V Key-On, which I am getting also.
    The blue wire is the light circuit, which is energized with key-on (not on a switch).
    I'm not sure what the other wires are for. Any ideas?

    I have the wires connected as shown in the schematic.

    However, every time I turn the key off, I lose the fuel used data, and it resets to zero. I maintain my miles traveled on my speedo gauge, but lose my total gallons used.
    I'm just trying to get the 'memory' to work. Inevitably, when I get back to the ramp, and trailer, I kill the engines without looking at distance and fuel burn...so I cant calculate my fuel data. I can get distance out of my MFD, but because my engines arent NMEA, I cant track fuel without the yamaha fuel management gauge.

    any input is appreciated

  • #2
    Have you verified that the red wire remains powered when the key is off and the battery switch is turned off?

    If the red wire remains powered but the gauge loses its memory when the key is in the off position then I would suspect that the gauge has failed. Time for a new one.

    Comment


    • #3
      Originally posted by boscoe99 View Post
      Have you verified that the red wire remains powered when the key is off and the battery switch is turned off?

      If the red wire remains powered but the gauge loses its memory when the key is in the off position then I would suspect that the gauge has failed. Time for a new one.
      Yessir, it remains powered with the key off.
      It does lose power when I turn off the battery switch, but that's expected. I don't turn off the battery switches until I get it home and charge it.

      I was just wondering if there was another wire that had something to do with memory...although I figured it was all internal to the gauge.

      I'll see if I can find a gauge. I wonder if I'd be better off just installing something that can read my fuel flow and display it on my EVO2 MFDs over NMEA 2k. I'll be repowering eventually, so hate to invest too much into the rigging on these older (but low hour and reliable) yamahas.

      Thanks for your input!

      Comment


      • #4
        Originally posted by RangerBay View Post
        wonder if I'd be better off just installing something that can read my fuel flow and display it on my EVO2 MFDs over NMEA 2k.
        Navico makes a N2K fuel flow sensor - but you would need 2 of course.

        https://www.hodgesmarine.com/Lowranc...-11517-001.htm

        And then, AFAIK,
        you also need an additional "module" for the MFD to "remember" how much fuel has been used

        https://www.hodgesmarine.com/Navico-...-11522-001.htm

        Cheaper to buy a brand new 6Y5 gauge:

        https://www.boats.net/product/yamaha/6Y5-8350F-01-00

        Comment


        • #5
          Don't know if this helps or not. I would take the "activated at the same time" comment with a grain of salt.

          I might want to probe the red wire at the point where it enters the gauge itself to make sure that it is getting battery power. Your connector could be faulty. Not uncommon.

          Last edited by boscoe99; 1 week ago.

          Comment


          • #6
            Originally posted by boscoe99 View Post
            Don't know if this helps or not. I would take the "activated at the same time" comment with a grain of salt.

            I might want to probe the red wire at the point where it enters the gauge itself to make sure that it is getting battery power. Your connector could be faulty. Not uncommon.

            Thanks for the info. I'll check that red wire in a bit. It definitely has power where the bullet connectors are all joined. The gauge has a rubber plug on it where the wires enter. I'm tempted to try to pull it off and see if the circuit is visible and accessible for probing. I gently tugged on it the other day but didn't want to pull a wire out.

            Any idea what the green wire and the green/white wire are sending/receiving from the tachs?

            Comment


            • #7
              Originally posted by fairdeal View Post

              Navico makes a N2K fuel flow sensor - but you would need 2 of course.

              https://www.hodgesmarine.com/Lowranc...-11517-001.htm

              And then, AFAIK,
              you also need an additional "module" for the MFD to "remember" how much fuel has been used

              https://www.hodgesmarine.com/Navico-...-11522-001.htm

              Cheaper to buy a brand new 6Y5 gauge:

              https://www.boats.net/product/yamaha/6Y5-8350F-01-00
              That Navico was my next step. I wasn't sure if the EVO2 was able to process the date without the additional module. I'll have to look into that more.

              I may just get a used gauge.

              Comment


              • #8
                Originally posted by RangerBay View Post

                Any idea what the green wire and the green/white wire are sending/receiving from the tachs?
                rpms, of course - for the Sync function

                Comment


                • #9
                  Originally posted by fairdeal View Post

                  rpms, of course - for the Sync function
                  duh...forgot about the sync.

                  Comment


                  • #10
                    There is a fellow that refurbishes Yamaha gauges. Mostly new lens' and polarizing filters I believe. You might want to contact him and see if he has any knowledge of the internal workings of the instrument. For all I know there could be a "mystery" fuse inside.
                    http://gaugesaver.com

                    Comment


                    • #11
                      Originally posted by boscoe99 View Post
                      There is a fellow that refurbishes Yamaha gauges. Mostly new lens' and polarizing filters I believe. You might want to contact him and see if he has any knowledge of the internal workings of the instrument. For all I know there could be a "mystery" fuse inside.
                      http://gaugesaver.com
                      I actually used him to refurb these gauges. I asked him around the same time I posted here. He just sent me an email back offering to ship me a gauge he has in stock, and if it works, he'll take my gauge in return at no charge (for parts, basically). Seems like a good deal.

                      Comment

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