2001 Mobius MDC location ??

[bergermaister]

Another solution to at least your speedo problem is something like this...



I have doubts though that there's an MDC hidden anywhere in there - yours or mine.

[Tydogg]

You didn't clarify if you are a D-Drive or V-Drive. Under the dash there are no fuses, or MDC. Only a circuit board for your manual switches and a pass through for the engine wiring harness to your gauges.



On mine (V-Drive) under the distributor (technically the back of then engine) and on top of the transmission is the main engine wiring harness connections. That's really all there is on these boats - pretty simple.







I would look there first for any vandalism.

I didn't trace the speedo cables/harness because it's 90 degrees in my garage, I have to go to a neighborhood function in about 15 minutes, and I need a beer or two first.

Thanks so much !! These will help tremendously!! I traced the speedo wires and they both run to a speedo wheel one on each side of the rear. Will start where you said and work my way back . Thanks so much guys will keep ya posted

[Tydogg]

The grounds on the circut board , under the guages main harness etc ....where do they go ? Your pic looks like they go UP from the circut board

[aerolland]

That year SHOULD have a MDC. Mine was a DD but should be similar - the key is to follow the pitot tubes, they plug directly into the MDC brain. They're hateful and prone to damage. Also, no longer available from Medallion...

From a post I just replied to:



Very familiar with that darn MDC...





It's located in this right rear corner behind the flexible carpet strip (in the rear locker). At least 2 screws to remove at the floor level, about 1' in from each end. Entire flex strip comes out. Follow small diameter pitot tubes (speedometer hoses) back to brain. This is how they fail BTW - diaphragms fail internally then water gets pumped into the control boards from the speedometer pickups.

[Tydogg]

That year SHOULD have a MDC. Mine was a DD but should be similar - the key is to follow the pitot tubes, they plug directly into the MDC brain. They're hateful and prone to damage. Also, no longer available from Medallion...

From a post I just replied to:



Very familiar with that darn MDC...





It's located in this right rear corner behind the flexible carpet strip (in the rear locker). At least 2 screws to remove at the floor level, about 1' in from each end. Entire flex strip comes out. Follow small diameter pitot tubes (speedometer hoses) back to brain. This is how they fail BTW - diaphragms fail internally then water gets pumped into the control boards from the speedometer pickups.

There is no MDC on this boat I assure you Haha!! I have literally ripped the interior out of the boat including the ski locker ....nothing. The speedo "tubes" which are 2 wires with 3 wires inside each go to speed wheels one on each side of the rear of the boat . Guages still arent working. Hooked everything up the way it should as I downloaded a wiring guide from Indmar and still nothing . The ballston, bower etc every single toggle works off the board but no guages . Ignition works properly as well it's literally just the guages . Put the guages on a bench and tested all , all tested good . There is something missing that I'm not picking up on . On the circut board there is multipul grounds which I believe come from the breakers in the panel above . The actual guages are gro unk ne through the wiring harness back to the engine where they connect into relays then into a small fuse panel . Have tested all the relays and they are all good however the fuel pump fuse was popped and melted . I'm now wondering if it's a ECU issue .....I wouldn't thnk this however I'm running out of options at this point

[Darter]

I'm almost certain that mdcs are only used on boats that use pitot pickups for speed reading to convert water pressure to an electrical signal.

Paddlewheels are an electro mechanical device, so no mdc is needed.

Pretty sure.

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[Tydogg]

I'm almost certain that mdcs are only used on boats that use pitot pickups for speed reading to convert water pressure to an electrical signal.

Paddlewheels are an electro mechanical device, so no mdc is needed.

Pretty sure.

Sent from my OnePlus 5 using Tapatalk

I believe that's correct . Mine run to speed wheels on each side and run directly to each speedo up in the dash