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2008 MMDC Delete and Gauage Replacement

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  • #16
    Ill try and take the connectors apart tomorrow and clean up any corrosion.
    I dont think I have any fuse holders going into the medallion unit on mine, atleast not round ones.

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    • #17
      I’ll try and take a pic of them when I go back out to the boat. Follow the power feed from the medallion, and you will see them. They take small glass style fuses.

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      • #18
        Like this.

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        • #19
          The MMDC setup on an '04 is a good bit different than the '08. His mostly likely problem are the capped connectors like Mike posted pics of above. While you can take the cap off, you can't take it apart to clean the connections internally. If there is corrosion when you take the cap off, you should replace it. Also, that connector you posted could use some love. Not sure what is going on there. The gray/clear wire, black wire and bare wire carry the CAN bus. The bare wire obviously has some issues. Both the clear/gray and black wire were spliced just before that connector, not sure why that would be there.

          I'd take that whole connector apart and rebuild it by cutting back to fresh wire and installed new pins. The parts are cheap on Amazon.

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          • #20
            Brian , I took both capped connectors apart and VERY CAREFULLY cleaned the terminals and pins. Then reinstalled with anti corrosion chemical . I could not find replacement pins and connectors only the plastic holder itself.
            If she don't shine , she ain't mine

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            • #21
              I cleaned up that connector a bit, I have no idea why the gray/clear and black wire were spliced, it seems to have been done to reduce the gauge of the wire for the connector, but it shouldnt have been neccesary. I checked all the pins and all were fine, so I only cut back the bare wire and put on a new pin, and then spliced new wires for the other two.
              I found a 4 pin connector by the motor, 3 red wires going to the circuit breakers by the battery switch, and a black wire which was disconnected. I have connected it to ground.
              I also checked the other connectors, which seem to terminate and didnt find any corrosion on the pins. Do you mean the corrosion could be in the cap where I cant see it?

              Im not sure whether I got bad readings the first time, or reparing those connections helped, but I now have around 8.3v at each of the gauge connectors. Is this correct?
              The behavior of the gauges are still the same unfortunatlely, key on, gauges seem like they want to cycle and go up maybe a quarter inch then back down, and dont give any readings.
              To others that have had issues, is this similar behavior to what you had?

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              • #22
                Originally posted by Benzick View Post
                Like this.
                I dont have these on my 2008, there is a car style fuse holder, one for vdig and one for mmdc, both were fine. Power and ground at the main mmdc connector is also fine.

                Anyone thing next step is to replace the mmdc? Or are they unlikely to fail?
                The one I have is $140 on GLS
                https://www.greatlakesskipper.com/ma...t-gauge-module

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                • #23
                  What was the remedy to fix this problem ?
                  If she don't shine , she ain't mine

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                  • #24
                    Probably sold the boat. Ha.
                    it would be nice to have people update so that the rest of us can benefit. I know it.s selfish.

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                    • #25
                      Ditch the MDC. Replace the gauges with analog.

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