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2008 MMDC Delete and Gauage Replacement

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  • 2008 MMDC Delete and Gauage Replacement

    The gauges on my 2008 x2 do not work at all. All i get is a tiny flicker in the gauges when turning the key, they do not full cycle and do not give any readings. I suspect the MMDC is dead. The VDIG works fine, except I do not get a fuel level reading and the screen has become very dim that its hard to read in sunlight.

    My understanding is the VDIG reads everything directly from the CAN bus and is seperate from the MMDC, so if it is deleted the VDIG would still work fine.

    Would analogue gauges work at all on a 2008 or newer boat? Or is this why noone has done it?
    Aesthetically I would need to figure out how to get the alumnium frames on new gauges.

    Click image for larger version

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    This is not my boat, but looks like this.
    Last edited by Baron515; 09-22-2019, 05:16 AM.

  • #2
    I believe the reason no one is doing it is because it hasn't been a problem to this point. About 05 the gauge crisis of the early 2000's was about done as Medallion had finally fixed their crap system and restored stability to their systems.

    I personally would be more inclined to fix what you have which could be a simple as "nut and bolting" everything from the MDC to the gauges along with the all the power connections and connectors. If no joy a quick game of "reduce to the ridiculous" where by you unplug all but one gauge at a time to see if you have a bad gauge causing the error would be my next step. If still no joy then a new MDC would be next in line and a simple bolt in repair.

    If this is not a suitable path for you and you still want to rip everything out, I see no reason following the conversion thread for the older gauge conversion wouldn't be the same. You're basically dealing with the same architecture and converting a digital bus architecture over to an analog system. As with the older system you would need to replace the senders for the temp, oil and fuel as well as wiring in the tach creating "home run" wiring to each as you go.

    Not so sure a conversion on this new of a boat would be a good move. If it were mine I'd certainly be fixing what I had.

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    • #3
      Had a similar problem on my 08 VDIG and guage system . there is a deutsch connector down by the starter and one under the dash . Take them apart and see if there is corrosion . I spent hours chasing this problem and once I discovered the corrosion when I finally took connector apart , it solved all problems. Good Luck.
      If she don't shine , she ain't mine

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      • #4
        pic of connector
        If she don't shine , she ain't mine

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        • #5
          Thanks for the advice, I have tried unplugging all the gauges and testing one a time but get the same behavior on each single gauge. Ill get my tester out and starting testing voltages and checking for good grounds or any corrosion, maybe I can repair it as you guys suggest.

          Mike, I dont see the pic of the connector, but I did try unplugging most of the connections and checked all fuses under the dash but I will check again more closely.

          Thanks!

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          • #6
            Sorry about pic . don't know what happened first time.
            Attached Files
            If she don't shine , she ain't mine

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            • #7
              This one when taken apart was badly corroded and causing all my electrical problems.
              If she don't shine , she ain't mine

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              • #8
                this one is behind door under dash. exactly the same connector
                Attached Files
                If she don't shine , she ain't mine

                Comment


                • #9
                  There is a very good thread on this under electrical .
                  If she don't shine , she ain't mine

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                  • #10
                    Here is a link to the thread where I battled similar issues:

                    https://teamtalk.mastercraft.com//sh...ad.php?t=70959

                    The fact that the VDIG works but not the gauges makes me think the CAN bus path to the front must be good (the VDIG reads that directly). This sounds like a failed MMDC box to me, it controls the individual gauges. I believe you can pick up a replacement at Great Lakes Skipper. I'd start probing voltages at the gauges to see if the MMDC was good, I believe the readings I saw are documented in that thread.

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                    • #11
                      How did you make out BARON515 ? Fixed ?
                      If she don't shine , she ain't mine

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                      • #12
                        Thanks for the replies and pics of that connector, I will definitely check that out as it seems that could be it as I have done a complete motor replacement and had to redo alot of the wiring back there. That thread is an excellent help.
                        Unfortunately I havent had chance to get round to working on it yet, but will be updating here once I do.

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                        • #13
                          I finally got chance to run some tests today. I believe it's bad wiring somewhere but I'm having trouble finding it.
                          I tested power at the gauge connectors and they all give under 3v, the same at the big connector on the mmdc. I get 12v at the main terminals under the dash, so I believe something between there is causing the issue.
                          Am I right that the wires for the can bus are the ones with the 1 bare wire? What is the bare wire used for?

                          Here is a pic of a connector under the dash which i believe is for the mmdc and vdig? It seems to have been messed with by a previous owner, and the bare wire is connected but almost broken.

                          Click image for larger version

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                          I checked the other plugs which seem like dead ends, one close to the mmdc and another close to the engine. Both seem fine but the bare wire is quite oxidized. Could this be a problem?

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                          • #14
                            Did you take those two connectors apart and inspect the terminals ? Looks like green corrosion on the base of two of those wires.
                            If she don't shine , she ain't mine

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                            • #15
                              2008 MMDC Delete and Gauage Replacement

                              I had a similar issue this year. It turned out to be corrosion on the two fuse holders going into the medallion unit. They are round, about 2 inches long. Replace the fuses, clean the contacts inside the holder, and try the system. It worked for me.

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