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View Full Version : Replaced mmdc and still nothing.


Topp dawg
10-08-2013, 10:56 PM
Today I replaced my mmdc on my 2003 x10 and my gauges still don't work. I bought a new mmdc from medallion and my gauges still don't function at all. The plugs all have power and ground that go to each gauge. I even tried only plugging one gauge in at a time. I checked all fuses and wires I can't figure out what the issue is. The boat starts and runs but I do have a check engine light on. Anyone have any ideas or tips I can try.

CC2MC
10-09-2013, 12:02 AM
If the light is on, then there is probably a code being thrown. You could get that checked at a dealer and go from there. Have you tried replacing a gauge? I wouldn't think that would be the issue, but just a thought. Where in the SE are you?

Topp dawg
10-09-2013, 07:24 AM
I am located in Niceville FL. So far i am unable to locate a local dealer that has a computer that would read the code. The closest dealer i could find was near Birmingham.

Topp dawg
10-09-2013, 02:18 PM
I have read many times though that the check engine light would not cause the gauges to not function.

Topp dawg
10-09-2013, 08:42 PM
I called medallion multiple times today and they have the worst customer service in the world. I asked them for a troubleshooting guide and they emailed me a picture of an mmdc. I called them back multiple times and they won't return my calls. I will keep calling tomorrow.

Topp dawg
10-11-2013, 09:19 AM
I finally got a troubleshooting guide from medallion and I took a volt meter and started testing wires. It turns out my original MMDC is good. I will be sending the new MMDC back for a refund. I have narrowed down the issue somewhat.


The correct volts are going into the MMDC and out of the MMDC but the 4 wire plugs that go into the back of each gauge is not receiving the correct volts. I think this means that the issue lies in the wire harness between the gauges and MMDC. I have checked the 3 fuzes i could find and they are good, i can't find any broken wires. I am confused on whats going on.


Anyone have any advice for me?

Topp dawg
10-11-2013, 11:49 AM
I just spoke with medallion again and they told me to unplug my Perfectpass and re-test all the wires. I don't see how this is related since my perfect pass is working fine and hasn't changed at all.

They also said the speedo calibration buttons are tied to the MMDC. I will be checking that switch tonight to test for a bad breaker.

Topp dawg
11-12-2013, 08:19 PM
I ordered new gauges from Medallion and installed them. Everything functions as normal. I still have a check engine light on so I will be taking it to the dealer at some point but at least my gauge issues are over.

JimN
11-12-2013, 08:53 PM
I ordered new gauges from Medallion and installed them. Everything functions as normal. I still have a check engine light on so I will be taking it to the dealer at some point but at least my gauge issues are over.

What is the resistance from the MDC ground to the battery negative post. Not the cable clamp, the post.

CantRepeat
11-13-2013, 09:10 AM
I ordered new gauges from Medallion and installed them. Everything functions as normal. I still have a check engine light on so I will be taking it to the dealer at some point but at least my gauge issues are over.

Every single gauge in your boat went bad at the same time? :confused::confused::confused::confused::confused:

mikeg205
11-13-2013, 09:43 AM
When did gauges stop functioning? was there any event where gauges stopped working?

lintwurm
11-13-2013, 09:54 AM
Where can I get that trouble shooting guide?

Topp dawg
11-14-2013, 12:05 PM
What is the resistance from the MDC ground to the battery negative post. Not the cable clamp, the post.

I won't have the ability to check this for about a week. What numbers should I be looking for?

Topp dawg
11-14-2013, 12:08 PM
Every single gauge in your boat went bad at the same time? :confused::confused::confused::confused::confused:

I had someone swap my blower and a few breakers out for me and he crossed a 12 volt wire to a 7 volt wire that runs to my gauges sending 12 volts to each gauge, killing all my gauges.

Topp dawg
11-14-2013, 12:16 PM
Here are the trouble shooting guides that Medallion emailed to me. I attached them as .pdf's.

mikeg205
11-14-2013, 04:09 PM
I had someone swap my blower and a few breakers out for me and he crossed a 12 volt wire to a 7 volt wire that runs to my gauges sending 12 volts to each gauge, killing all my gauges.

that would do it... yikes...

Topp dawg
11-14-2013, 08:20 PM
Yep I wasn't too happy with the situation.

JimN
11-15-2013, 07:22 AM
I won't have the ability to check this for about a week. What numbers should I be looking for?

Ground wires should always be as close to zero Ohms as possible and by 'possible', it means that if it's not zero Ohms, it needs to be repaired so it is. This isn't optional, it's necessary for the proper operation of whatever is using the ground. New accessories should NEVER be added to a power or ground wire that's being used for something else, unless they were sized for additional accessories, but only up to the limit of those wires for the purpose of conducting current. As soon as a device draws more current when conducted by a wire, the voltage drops and that's where problems begin.

Topp dawg
11-15-2013, 09:52 AM
Thanks for the tip I will check this out next week.