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2000 Cobia with Yam 0x66

Old 07-16-2014, 09:20 PM
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Default 2000 Cobia with Yam 0x66

Hi to forum, but past reader of all the great info. I have an opportunity to buy a 2000 Cobia 206 Deckboat with a Yam 150 2 stroke OX66 Fuel Injected.

PROBLEM: Intermittent gauges. It has gauge system unlike what I have seen before....they do not have the threaded posts on the back for connection to systems but instead have a single "quick connect" plug on the rear of each gauge. There is no manufacturer name on the gauges, but I have been told that that they are Yamaha. It is not the multi function Yamaha gauges common today...there is a separate gauge for speed, tach, fuel, tilt, temp, etc.
I have traced the wires and found a junction box aft on the port side that brings in the harness from the engine then sends it to the gauges. (Interface box?) It is a wet environment and the connectors in/out of this box are in poor shape, and I think the box may be bad.

MY QUESTION: Where do I find info on this box/gauge system? Cobia referred me to Yamaha. My local Yamaha dealer can't help. Back and forth. I guess I can't blame them much as I have no part numbers to go on, just the hull ID and the engine model number. Anybody familiar?
Old 07-17-2014, 05:06 AM
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Can you post some pics?
Old 08-20-2014, 03:27 PM
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Default same here...,,

-- I was not sure if my previous post went through
I have the same boat and somehow the same problem. In addition to the gauges, you will (or may have already) find out that there is a central controller that manage all of your gauges made by Medallion (Called MDC medallion..) I have found that this controller is very sensitive to air electrical charge which will cause it to fry. I have replaced two MDCs already and my third one is already fried again. As of this week, I have decided to:
- Buy new Gauges (Tac, Fuel, Vol, Trim, and a GPS speed) to replace the existing ones.
- Wire the new gauges directly from outboard harness bypassing the MDC.

I'm not a pro but I certainly can tackle this project... I'll be happy to share my findings. I've had my boat for years and I can tell you that gauges' replacement is the best way to go if you plan to keep the boat... and your sanity.
btw- the GPS speedometer is somehow pricey and I'm still debating on weither to buy it or not. Most likely I won't as I will substitute my smartphone free apps that provide GPS speed as well as additional useful features. I also recommend that you look into replacing the fuel sender unit, for safety reasons.

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