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Mercruiser Alpha shutting off

Old 06-16-2016, 04:32 PM
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Default Mercruiser Alpha shutting off

I have a 2014 alpha that likes to shutoff when hitting a wave. Boat will start up again in neutral but then shuts off when I go into gear. If I wait a little while the boat goes into gear until I hit another wave. Any ideas? I'm thinking something is loose with my electrical but I don't even know where to start checking.
Old 06-16-2016, 06:35 PM
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I think there is some kind of kill switch that will not allow you to start the boat in gear its probably on the shift linkage somewhere that's my best guess
Old 06-16-2016, 08:24 PM
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Originally Posted by vonshep View Post
I think there is some kind of kill switch that will not allow you to start the boat in gear its probably on the shift linkage somewhere that's my best guess
Thanks for the info. Any idea how I get into the shift linkage?
Old 06-17-2016, 02:41 AM
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Any other ideas out there?
Old 06-17-2016, 04:57 AM
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there is a shift interrupt switch that briefly stops the spark when you shift gears to allow the shift to occur more easily. This sounds to me like it's loose or gone bad. I suggest you look up a diagram for the outdrive and find where it is mounted. it will be on the transom plate somewhere.
Old 06-17-2016, 06:10 AM
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the shift linkage is mounted somewhere on the engine depending on the engine on a 3.0 its mounted just below the valve cover on the side of the motor right in front of the plugs
Old 06-17-2016, 06:19 AM
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Check all Wiring Harness connectors...
Old 06-17-2016, 06:25 AM
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Originally Posted by Lone Ranger View Post
Check all Wiring Harness connectors...
Where would these be? On the engine block? I know.. stupid question. I'm learning.. thanks
Old 06-17-2016, 06:29 AM
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Should be a main harness on the Engine.Then somewhere a connector that connects the Engine harness to the main harness running up to the Dash.Check ALL ground connections and Power connections also.Late model production Boat...Not unheard off to find something that was Not connected properly in a rush to blow them out the Door!
Old 06-17-2016, 06:32 AM
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I had a similar problem with my old 5.7 mercruiser with an alpha 1 outdrive. There is a switch on the shift linkage the momentarily kills the spark when switching in and out of gear that could be going bad. This is what happened in my case. The shift switch should be top of the engine near the throttle body/carb.
Old 06-17-2016, 06:50 AM
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What engine do you have?
A 2014?
It should be under warranty. My suggestion is take it back to the dealer because your just going to create more issues.
I don't think it's an interrupt switch. The shift interrupt only works when shifting out of gear.If there is any resistance of the shift cable the engine will stall going in and out of gear. When the cable is free the shift interrupt is only for a moment. The interrupt is so quick you shouldn't notice.
The purpose of the switch is to stall the gears momentarily, stopping movement for just a split second to pull out of gear. As stated any resistance of the cable will cause stalling.
The switch is on the end of the shift cable near the throttle body. Hitting a wave isn't going to make the interrupt switch stop the boat

Last edited by Thalasso; 06-17-2016 at 07:06 AM.
Old 06-17-2016, 07:13 AM
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Check for a loose connector in the cable assembly along and under the starboard gunnel as you check all the other connectors for secure attachment.
Old 06-19-2016, 01:04 PM
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Originally Posted by reelintheyears View Post
I had a similar problem with my old 5.7 mercruiser with an alpha 1 outdrive. There is a switch on the shift linkage the momentarily kills the spark when switching in and out of gear that could be going bad. This is what happened in my case. The shift switch should be top of the engine near the throttle body/carb.
Thanks for the info. Do you have a pic of where the switch is located?
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Old 06-19-2016, 03:54 PM
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Just checked all my electrical and didn't see anything fishy. Could it be my fuel-water seperator?
Old 06-19-2016, 04:01 PM
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This is about what mine looked like. From your picture above it might be the switch with the purple wires to the left of the shift linkage. Google mercruiser shift interrupter switch and you will see many examples. Best of Luck.
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Old 06-19-2016, 04:13 PM
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Originally Posted by reelintheyears View Post
This is about what mine looked like. From your picture above it might be the switch with the purple wires to the left of the shift linkage. Google mercruiser shift interrupter switch and you will see many examples. Best of Luck.

Many thanks!
Old 06-19-2016, 05:36 PM
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Originally Posted by Thalasso View Post
What engine do you have?
A 2014?
It should be under warranty. My suggestion is take it back to the dealer because your just going to create more issues.
I don't think it's an interrupt switch. The shift interrupt only works when shifting out of gear.If there is any resistance of the shift cable the engine will stall going in and out of gear. When the cable is free the shift interrupt is only for a moment. The interrupt is so quick you shouldn't notice.
The purpose of the switch is to stall the gears momentarily, stopping movement for just a split second to pull out of gear. As stated any resistance of the cable will cause stalling.
The switch is on the end of the shift cable near the throttle body. Hitting a wave isn't going to make the interrupt switch stop the boat
X's 2
Old 06-19-2016, 06:04 PM
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what are your gauges doing? any alarms? maybe a faulty ignition switch
Old 06-19-2016, 07:00 PM
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X2 on the warranty!
Old 06-19-2016, 07:30 PM
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My vote is the shift kill switch. The spring may be offset and not holding the actuator in the middle of its position, and it may be depressing the switch that kills the motor. Or the linkage may be poorly adjusted.

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