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Old 07-10-2013, 01:50 PM
Bwardz50 Bwardz50 is offline
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Join Date: Jul 2013
Boat: Mastercraft, X2, 2005, MCX350
Location: Southeast
Posts: 6
Unhappy '05 MCX 350 Vortec stalling

Hey everybody, thanks for reading this. I have an '05 x2 MCX 350 with about 250 hours. recently I've been having an issue where after pulling my kids on the tube for a while, the engine will stall out while under load. The radio also shuts off as well as all of the gauges. then about five seconds later, everything comes back on again and I can restart. I'm leaning toward the "ignition" circuit because when I disconnect the wire from the breaker labeled "ignition" it acts the same way. I tapped on this breaker while the engine was running and it didn't fail so I'm wondering if there's a thermal breaker somewhere else on that circuit that resets itself? My guess is that it would be somewhere in the engine compartment as it seems to be heat related. I also tapped on the ECU and voltage regulator with a screwdriver handle while running and couldn't reproduce. I excersized all the connectors in the engine compartment and didn't see any corrosion. This boat is only used in fresh water. Gauges all read normal, oil is about 70psi, and water temp is at 160. Thanks again for reading and any help.

Brian - Tampa
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Old 07-10-2013, 06:49 PM
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petermegan petermegan is offline
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Join Date: Dec 2010
Boat: 2000 Matercraft Prostar 190, LTR330,powerslot,PP,heater
Location: South Australia
Posts: 477
Out of my league here, but can I suggest to check the Earth connections on the motor. Just wondering if they are corroded and getting hot?? If the ECU gets low on voltage it won't be happy.
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Old 07-10-2013, 08:59 PM
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Jerseydave Jerseydave is offline
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Join Date: Jul 2004
Boat: 2005 X-STAR & 1995 Prostar 190
Location: Jersey
Posts: 6,182
I would start with the basics of checking battery condition, charging system, cables and connections, etc. Kinda sounds like your alternator may not be charging or the battery is not holding a charge.

If you can't figure it out and need help, I'm sure Bay Area Watersports (Jim) can help you out. Great dealer, you're lucky to be so close to them. I'm 2+ hours from my nearest MC dealer.
I was njskier on here.
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Old 03-03-2015, 01:26 PM
Bwardz50 Bwardz50 is offline
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Join Date: Jul 2013
Boat: Mastercraft, X2, 2005, MCX350
Location: Southeast
Posts: 6
Hi everybody. I did fnally end up solving this issue about 6 months ago. It was a wierd one so I thought someone else may have this issue and benefit from reading this.

The circuit breaker mounted to the engine was opening only after warmed up and under a load. Then, before I could grab my multimiter and check, it would reset itself. The lever on the breaker would never actuall show "tripped" so I thought this was a strange way for it to fail. I tracked down the replacement and special ordered it from Summit racing and it's been fine ever since.
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Old 01-05-2017, 08:52 PM
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gwozhog gwozhog is offline
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Join Date: Jul 2013
Boat: Achilles sg124
Location: south
Posts: 664
Nice you finally answered your problems solution even if it took 2 years. I can't tell you how many of this problem threads go unanswered on TT.
I once dated a girl in high shcool and her dad told me I would never amount to anything. He was right.
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Old 01-05-2017, 08:54 PM
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mikeg205 mikeg205 is offline
Join Date: Aug 2011
Boat: 1995 Pro Star 205 5.7 Liter
Location: Plainfield - Joliet, IL
Posts: 17,570
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yeah no kidding gwozhog...
...A bad day water skiing still beats a good day at work...1995 Pro Star 205....
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breaker, load, mcx 350, stalling

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