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Charles
Charles, Marine Mechanic
Category: Boat
Satisfied Customers: 3431
Experience:  US Navy (Ret) Certified Mercury Marine Tech with over a decade of repair experience.
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I have a Mercury 200hp Outboard Optimax. Its got one ,

Customer Question

I have a Mercury 200hp Outboard Optimax. Its got one long, continuous pulsating beep & it will not crank. What's wrong? PLease help.
Submitted: 10 months ago.
Category: Boat
Expert:  Charles replied 10 months ago.

Hello, my name is***** will assist you.

Will the engine spin over and not start, or will it not spin at all?

Would you please post the serial number of the engine?

Customer: replied 10 months ago.
qto19765 it spins over great just wont crank. it has a loud contuis pulsating alarm as soon as you turn the key
Expert:  Charles replied 10 months ago.

The serial number will start with a 0 or a 1, followed by a letter, then 6 more numbers. Or do you know the year of the engine?

Customer: replied 10 months ago.
1999
Expert:  Charles replied 10 months ago.

Ok thanks. first thing to look at is the kill switch in the boat. Make sure that it is fully in the run position.

Then I will need to know the CCA size on the battery.

Customer: replied 10 months ago.
do i have a kill switch and if so where would it be? i dont see anything around the ignition key like all my boats in the past. i have two new batteries 845cca. two weeks old
Expert:  Charles replied 10 months ago.

What control box do you have?

Can you post a pic of the dash and control here?

Customer: replied 10 months ago.
Mercury Quicksilver controls.
Expert:  Charles replied 10 months ago.

Your not trying to start in gear are you?

Expert:  Charles replied 10 months ago.

when did the engine last run?

Customer: replied 10 months ago.
No, it won't spin over in gear. i just got the boat back from a mechanic of sorts. i had to have the 80 gallon tank cut out of the floor and replaced. i just this morning got a new starter installed. he was either busy or slow so to answer your question it hasnt been crunk and running in 12 months. im not sure if this boat had a kill switch. but if it did i cant see where it would go. however i do notice something missing from my boat keys since i got it back but im not sure what
Expert:  Charles replied 10 months ago.

Do you hear the fuel pumps run when you turn the key on?

Can you get into the console and locate the black/yellow wires and make sure that they are connected properly and not to a black?

Customer: replied 10 months ago.
i cant hear anything with the alarm screaming the second you touch the key
Expert:  Charles replied 10 months ago.

If you have a helper, remove the engine hood, then have them turn the key from off to ON, you should hear 2 pumps turn on.

Customer: replied 10 months ago.
the wires come out of the ignition and go directly into a cluster headed under the floor of the boat
Expert:  Charles replied 10 months ago.

Yes, in that cluster is a black and yellow wire, this is the kill circuit.

Can you test the pumps, and while your on the engine, check all the fuses.

Customer: replied 10 months ago.
both pumps seem to be coming on. one on each side of the engine
Customer: replied 10 months ago.
i have one cluster of fuses at the engine. all 20 amp. all 4 fuses are good
Customer: replied 10 months ago.
these wires arent plug type wires they are hard wired
Expert:  Charles replied 10 months ago.

The wires you mention, is that the key switch wires?

Customer: replied 10 months ago.
Expert:  Charles replied 10 months ago.

ok, Can you test it for spark?

Customer: replied 10 months ago.
all six are firing
Expert:  Charles replied 10 months ago.

Is this alarm beeping or solid in tone?

Customer: replied 10 months ago.
its constant but pulsating in tone
Expert:  Charles replied 10 months ago.

Ok, Locate the oil tank on the engine, unplug it and see if the alarm stops. If not, remove the fuel filter canister filter, and pour it into a glass jar. See if you have any water in it.

Customer: replied 10 months ago.
all this on the fuel side is brand new. filter tank and hoses. the alarm on the oil tank when it goes off isnt constant. i found that out the hard way. but i will go check it tho
Customer: replied 10 months ago.
ok i unplug the oil tank and the constant beep went away. now i hear 4 intermittent beeps
Customer: replied 10 months ago.
gas filter seems to be clear of water and debris
Expert:  Charles replied 10 months ago.

Ok, Can you test the battery power going to the engine?

Sorry about the delay, I lost power.

Customer: replied 10 months ago.
8.2 while trying to crank. 12.5
Customer: replied 10 months ago.
12.5 before you spin it over
Expert:  Charles replied 10 months ago.

Ok, these engines need at least 9.5 to the ECU to even start. Try a set of jumper cables from the battery to the engine. See it if will then start. If it does, you either have dirty connections or bad battery cables.

Customer: replied 10 months ago.
i dont have jumper cables that long. would it be safe to jump it off from my truck
Expert:  Charles replied 10 months ago.

Yes, you can use the truck battery. Place the red from the cables on the red of the starter solenoid, the black to a good engine ground.

Customer: replied 10 months ago.
now its spinning over at 9.7. alarm still going off. 4 pulsating beeps and 1 long constant beep afterwards
Expert:  Charles replied 10 months ago.

Did it start?

Customer: replied 10 months ago.
didnt even try
Expert:  Charles replied 10 months ago.

Put some water to it and give it a go.

Customer: replied 10 months ago.
i did that it sounds like it occasionally wants to fire but the alarm isnt stopping
Expert:  Charles replied 10 months ago.

Look at the temp senders on the cylinder heads and the air compressor. Make sure that all of them have all 3 wires plugged in.

With the key on, engine off, with the alarm going off, move the throttle let me know if the alarm stops.

Customer: replied 10 months ago.
help me with temp senders. im not sure what they are. however i checked every wire and harness i saw. i checked the alarm its coming on and off 4 times and nothing else. the throttle didnt stop the beeping
Customer: replied 10 months ago.
this all seems to be plugged in
Expert:  Charles replied 10 months ago.

There is also one on the air compressor. Looks just like the other 2.

Customer: replied 10 months ago.
its plugged tight as well
Expert:  Charles replied 10 months ago.

Check to make sure that the TPS, air temp, the coil drivers and the coils. are all plugged in as well.

Customer: replied 10 months ago.
ok it all seems to be plugged in secure
Expert:  Charles replied 10 months ago.

Alright, is the oil tank still unplugged?

Customer: replied 10 months ago.
no
Expert:  Charles replied 10 months ago.

Alarm still sounds?

Customer: replied 10 months ago.
but not constant. 4 beeps then it goes off
Expert:  Charles replied 10 months ago.

Is that a 4 light warning light in the dash? Does it work?

Customer: replied 10 months ago.
my light doesnt work
Expert:  Charles replied 10 months ago.

That would really help here. Do you think it may only be the bulbs?

Customer: replied 10 months ago.
im not sure. dont know how to check the bulbs. im calling it quits for today
Expert:  Charles replied 10 months ago.

They are just regular small light bulbs. You can either look at them or use a multimeter set or resistance to check them.

Talk to you later.

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