4.3L MPI 2007 Searay Sport 185. Single Alarm at 20 RPMs and higher

[Nord2903]

Perhaps start first, then disconnect.

Did also. Killed the engine

 

[Nord2903]

In should, its not the neutral safety
In any case, fire it up then disconnect

I did. Boat engine died when I removed it.

 

[alldodge]

Looks like 2 witches there, and that means an Alpha drive
The one you disconnected was the shift interrupter, do the one above it

 

[Nord2903]

Looks like 2 witches there, and that means an Alpha drive
The one you disconnected was the shift interrupter, do the one above it

The one above i disconnected before starting and the engine wouldn't turn over. I then replugged it in, started the engine, then pulled it again and the engine died.

 

[alldodge]

Your saying either one of the switches makes the engine die when disconnected?

 

[Nord2903]

Your saying either one of the switches makes the engine die when disconnected?

Yes. The larger one thats in my hand above the blue connector.

 

[alldodge]

That's making me scratch my head real hard. The In gear switch should not do that. Got to go look at my manual some more

 

[Nord2903]

That's making me scratch my head real hard. The In gear switch should not do that. Got to go look at my manual some more

I am just as baffled. But those are the only two connectors I see near the plate.

 

[alldodge]

Wiring shows 3 wires on the shift switch and 2 wires on the in gear

The in gear switch should be closed when in neutral and open when in gear. Disconnect the switch and use a ohm meter to check continuity

If no meter try this but need to do this in open water
Put in gear going forward then disconnect the 2 wire switch. See if it stays running. If it does take it above 2000

 

[Nord2903]

Wiring shows 3 wires on the shift switch and 2 wires on the in gear

The in gear switch should be closed when in neutral and open when in gear. Disconnect the switch and use a ohm meter to check continuity

If no meter try this but need to do this in open water
Put in gear going forward then disconnect the 2 wire switch. See if it stays running. If it does take it above 2000

Give me a few, grabbing the multimeter and going to check.

 

[Nord2903]

Give me a few, grabbing the multimeter and going to check.

Not sure if I did it correctly but with the engine off and checking the switch it gave me a reading of 1200

 

[Nord2903]

Give me a few, grabbing the multimeter and going to check.

I also disconnected the ingear switch like you said (boats on the trailer) and revved it to 2000 rpms and the alarm still sounded.

 

[alldodge]

How did the switch check out?

 

[Nord2903]

How did the switch check out?

Not sure if I did it correctly but with the engine off and checking the switch it gave me a reading of 1200

 

[alldodge]

Not sure if I did it correctly but with the engine off and checking the switch it gave me a reading of 1200

In neutral of in gear?

Wait your on a trailer and 2000 RPM, Ahhh the plot may be thickening
Your motor has a water pressure switch on the power steering cooler. When the engine RPM's increase over 1800 the pressure must be high enough or the ECM will alarm and decrease RPM's to save the motor.

The water switch may not set a hard code because when RPM's go down its good again. Need to be running in the water with a Techmate or Diacom to see. Unsure if vessel view will show but maybe Q would know

 

[Nord2903]

In neutral of in gear?

Wait your on a trailer and 2000 RPM, Ahhh the plot may be thickening
Your motor has a water pressure switch on the power steering cooler. When the engine RPM's increase over 1800 the pressure must be high enough or the ECM will alarm and decrease RPM's to save the motor.

The water switch may not set a hard code because when RPM's go down its good again. Need to be running in the water with a Techmate or Diacom to see. Unsure if vessel view will show but maybe Q would know

Yes, its on the trailer. I tested the water pressure switch on the power steering cooler earlier this morning. With the sensor disconnected I ran the engine on the muffs and when it got to 2000 rpms, the alarm sounded and went into guardian mode. Therefore cant I rule out the water pressure switch? I have never had an issue like this and I have spring prepped my boat like this for 10 years.

 

[alldodge]

The water switch is the number one failure on these motors. With it disconnected it tells the ECM there is zero pressure

 

[alldodge]

And running the motor above 1600 can burn the impeller

 

[Nord2903]

The water switch is the number one failure on these motors. With it disconnected it tells the ECM there is zero pressure

Alright. I did have a call out to pick one up, which I can do tomorrow, but there like $178.00. Is it possible to get one that from Advanced Auto or Napa. I found them on amazon for like 40, but id prefer to have it immediately.

 

[Nord2903]

And running the motor above 1600 can burn the impeller

I also thought about that. I just changed the impeller I believe 2 years ago but can take a look at it.