Mercury stalls while underway

[depressed boater]

I have a 2005 Mercury ELOPT 50hp, the motor will stall while under way. It has done this since the baot was new. I took the boat back to the dealer every time it happened. Long story short- dealer out of business, dealer did not record issues with Mercury, No help from Mercury!
The motor will be running fine, once it is warmed up it misses, spits, and stalls. After a few minutes the motor fires back up and runs good.
At times when I use the power trim while underway the boat stalls. Two weeks ago the boat stalled and would not start back up. I took it to another machanic and he replaced the stator. I took the boat out yesterday and it stalled again. The Statwas bad, I thing what ever the problem is, its electrical, and killed the stator. The old stator has melted rubber at the connections, I also found the same melted rubber on the regulator connections. I taped the wires so they wouldn't short but the motor still stalls.
I am taking the machanic for a ride on the boat in a few days. Does anyone have any ideas? Has anyone had this problem?
I need to fix my boat, it is too depressing having a broke boat, lifes too short to have a broken boat.

 

[Laddies]

Re: Mercury stalls while underway

Unplug the 2 yellow wires at the regulator tape them off and test run if that fixes it you have a bad regulator

 

[depressed boater]

Re: Mercury stalls while underway

I'll give it a try as soon as Noel passes.
thanks

 

[j_martin]

Re: Mercury stalls while underway

This should have been registered with Mercury. If it wasn't, and you have witness, there is a number you could call at Mercury where they could perhaps point you to a good dealer, and also warranty the work.

Mercury carefully guards it's good name. Be persistant, it came to you with a bad part or 2, probably not major, and it needs to be fixed.

hope it helps
John

 

[depressed boater]

Re: Mercury stalls while underway

I have the work orders for the work that was done (or lack of work). Mercury said they will review the case when I find what is wrong with it. I also found the rubber around the connections on the two yellow wires and one of the red wires were melted. I sepirated the wires taped them off, no that Noel passes I will test it the next day or so. Stand by for updated.
Thanks for your help.

 

[depressed boater]

Re: Mercury stalls while underway

woops those wires are on the regulator

 

[Texasmark]

Re: Mercury stalls while underway

Sounds like you have a short somewhere supplying excessive current through the system which is melting your wires. A diode in your regulator is a good place to start.

Also, since this is an original problem, maybe you have a pinched wire somewhere; might look around for that too.

I'd do what Laddies says with the yellow wires to the regulator and also disconnect the red leads from it too....completely isolating it from the circuit.

Insure your battery is at full charge before you go out again.....

Mark

 

[Texasmark]

Re: Mercury stalls while underway

Missed this. On the stall when trimming, you are loading your battery with excessive current (normal function). If it is weak (because your regular has a problem and isn't charging your battery like it is supposed to, or has a short which is draining battery power) the battery could be dropping (during trimming) to a voltage too low to sustain spark and your ignition to your plugs dies, hence engine stalls.

Course if the battery were that weak I'm surprised that you have enough power to restart your engine.

Confusing.

Mark

 

[Laddies]

Re: Mercury stalls while underway

Your engine is CDM or alternator driven and don't use battery voltage to run the stator suppies that on a as needed basis.

 

[depressed boater]

Re: Mercury stalls while underway

I ran the motor with the wires taped up to insure that they weren't shorting, the motor still stalled. I disconnected the regulator, the motor still stalls. I have a machanic who is going to run the boat, when it stalls he is going to replace the CDMs one at a time. It is nice to finally have a mechanic who will do more than run the motor on a hose for five minutes and say nothing is wrong with your boat.

 

[depressed boater]

Re: Mercury stalls while underway

The mechanic found a bad rev-limiter. He ran the boat until it stalled, disconnected the rev-limiter and it ran for a while, then he pluged in the limiter and the boat stalled. I think it may be fixed,keep your fingers crossed.

 

[j_martin]

Re: Mercury stalls while underway

The mechanic found a bad rev-limiter. He ran the boat until it stalled, disconnected the rev-limiter and it ran for a while, then he pluged in the limiter and the boat stalled. I think it may be fixed,keep your fingers crossed.

Now you know why the dealer went out of business. Ignorance can be cured with education, but stupid is forever.

 

[Texasmark]

Re: Mercury stalls while underway

Hey laddies, I was in my '02, 90 hp serv man the other day and came across the trigger circuit. Very good explanation supporting what you said. Looks like it just has a bunch of magneto's under the flywheel (coils and rotating magnets) to supply module operating voltage, module trigger voltage, and alternator function.

So, like you said, battery has nothing to do with it. Guess they set the engines up this way, as a standard way to do it, so that the manual start engines don't need batteries to operate....like the old point-condenser-coil days and they don't need two different ignitions for the man and elect start engines.

Mark