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Old 11-18-2017, 11:34 PM
BeJay1981 BeJay1981 is offline
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06 X2 Gauges and Radio Not Working - Buzzer On Constant

I've done some searching but haven't seen my exact issue:

I was getting the boat ready for our last outing the other day and with the key on and lanyard in (motor not running) the gauges would cycle on and off intermittently. Coincidence or not, it seemed if I jiggled the throttle they would turn back on but additional throttle movement didn't seem to correlate with them going dead, they would just shut off randomly every 10-30 seconds.

Anyways, I towed it about 80 miles to the ramp and when I started it I had no gauges, the buzzer was on constant and the radio wouldn't power on, otherwise everything else worked perfectly. Throughout the day I checked battery connections, inspected and re-seated harness connections, fuses, etc and finally when I pulled the smaller connector off the mmdc the buzzer quit and the radio powers on, obviously no gauges still. Although the radio is working, there is a slight high pitch feedback noise in the background.

When we got home I checked voltage at the mmdc harness. With the motor off I have 12.3 volts at the red wire and 12.08 volts at the purple wire (With lanyard attached). Voltage is identical on both readings using ground at the connector or the nearby ground bar. Voltage reading at the battery is the same 12.3.

I'm a little puzzle why this issue effects the radio? And am I leaning towards having a bad mmdc? Any input you guys have would be greatly appreciated.
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  #2  
Old 11-20-2017, 09:09 PM
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gwozhog gwozhog is offline
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I think your battery is week. Anything below 12.5 volts in no bueno. Especially after running it when the alternator has been charging it. Radio amps have low voltage safeties that shut them off.
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  #3  
Old 11-21-2017, 12:02 PM
tommurtha tommurtha is online now
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I had a similar issue when I first got my boat. It was the gauge.. The gauge reads lower than it should and triggers the alarm which also then shuts down the radio. In mine the radio came back on after of minute or so then the cycle started again
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Old 11-21-2017, 02:00 PM
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rgardjr1 rgardjr1 is offline
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I've had similar problems as few times in the past with my boat. In my case it was always due to the battery being low. On my boat none of the gauges would work except the Perfect Pass digital display. I installed an on board charger and this problems went away.
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Old 11-22-2017, 12:19 PM
BeJay1981 BeJay1981 is offline
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Boat: Sold - Mastercraft X2 2006 MCX
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I appreciate everyone's suggestions so far.

I've put the battery on the charger and even leaving the charger hooked up I was able to get 13.1V to the red wire and 13.0V to the purple wire but still no gauges and the buzzer is constant.

I unhooked all the gauges I could reach but that doesn't seem to help and I'm not seeing any voltage at the gauges themselves. I also swapped in a new relay that was right there by the buzzer and no change.

Anyone have a MMDC they want to sell or let me borrow and try out? 7020-20015-01 is the # on my box.
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Old 11-22-2017, 12:59 PM
bdiesel bdiesel is offline
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Check the inline fuses on the red and purple wire for corrosion. I had the sames symptoms as you and found corrosion at the fuse connections. Cleaned them up and it corrected the problem.
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Old 11-22-2017, 09:39 PM
BeJay1981 BeJay1981 is offline
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Boat: Sold - Mastercraft X2 2006 MCX
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Where should I find a fuse on the purple wire? I have located 3 right in a row behind the dash labeled mmdc (red wire), perfect pass, and paddle wheel.
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  #8  
Old 11-22-2017, 10:02 PM
bdiesel bdiesel is offline
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On my boat they are side by side to the left of the MMDC just under the steering rack.
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  #9  
Old 11-23-2017, 08:21 AM
BeJay1981 BeJay1981 is offline
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Ok cool, I'll keep digging around back there and see what I can find.

I think my last check will be to hard wire the MMDC red, purple, and ground to the battery to eliminate any remaining factors.

Last edited by BeJay1981; 11-23-2017 at 08:37 AM.
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  #10  
Old 12-23-2017, 05:36 PM
BeJay1981 BeJay1981 is offline
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Just a quick update that I've checked all the grounds, fuses, breakers, connections almost throughout the entire boat. Finally hardwired the purple wire straight to battery. Still nothing.

I think it's MMDC replacement time.
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