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  1. 06-05-2019, 09:06 AM #1
    blackboat
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    Warning horn diagnostics 200 EFI

    Serial number 0G654534. Motor has an occasional steady continuous beep.Sometimes it will do it after startup on a cold motor. It likes to do it in a plow no plane situation in rough water but never does it when running smoothly on plane.Stop and restart and the warning quits for a while. The motor runs fine otherwise.One would think it would be an over heat thing but the cold start warning has me guessing.The complete water pump assy (Merc) was replaced with only a few hrs on it but the warning was present with the old pump.I'm 99.9 % sure the pump was done correctly as I've done a lot of them with no problems.Any suggestions before I start throwing parts at it? Thanks!
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  2. EuropeanAM
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    #2 06-05-2019, 06:15 PM
    Steady Continuous means there are no breaks or stops- which is almost always OVERHEAT.

    If it's really FAST BEEPING (continuous)- Numerous possible causes, good idea to obtain and utilize a Factory Service Manual for guidance.

    Among the possibilities are:

    -Water in fuel
    -Loss of spark on ONE or MORE cylinders
    -Loss of ground to Oil Warning Module
    -Pump Rotation Problem
    -Sensor or Magnet problem
    -Variety of wiring or connection problems


    Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
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  3. blackboat
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    #3 06-06-2019, 08:02 AM
    Yeah,Don,it is a steady continuous beep but like stated,it will occasionally do it immediately after start up on a cold motor.I agree that beep generally indicates overheat but it couldn't possibly be hot in that situation.Key off and restart will clear it.I do have the factory service manual.
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  4. JOE54
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    #4 06-06-2019, 08:15 AM
    warning module bad ,41470a25 warning they high $$$$$$ now north of 400 list
    .................................................. ...the scariest thing in life is the unknown ...................................
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  5. blackboat
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    #5 06-07-2019, 08:15 AM
    Quote Originally Posted by JOE54 View Post
    warning module bad ,41470a25 warning they high $$$$$$ now north of 400 list
    Joe,I was afraid of that.Way back at the turn of the century,same thing happened and the module was replaced under warranty.Lasted 19 yrs but wished it would had gone a few more!
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  6. JOE54
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    #6 06-07-2019, 08:33 AM
    you want used one , I got one no quarantee it s good but it w as when I pulled it off, itll be cheap real cheap like FREE just shipping from usps
    .................................................. ...the scariest thing in life is the unknown ...................................
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  7. blackboat
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    #7 06-08-2019, 08:01 AM
    Quote Originally Posted by JOE54 View Post
    you want used one , I got one no quarantee it s good but it w as when I pulled it off, itll be cheap real cheap like FREE just shipping from usps
    I'll take it Joe. Thanks my friend.I'll pm you my address. Ya know...on electronic stuff,some of it lasts forever and some barely make it out of the box
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  8. JOE54
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    #8 06-08-2019, 12:24 PM
    il put it in mail next week soon as I can
    .................................................. ...the scariest thing in life is the unknown ...................................
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  9. Bob
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    #9 06-08-2019, 02:03 PM
    Nice! two attaboys and a thumbs up
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  10. blackboat
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    #10 06-10-2019, 06:30 AM
    Thanks,Joe!! I'll make it right with you
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  11. JOE54
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    #11 06-10-2019, 06:33 AM
    .................................................. ...the scariest thing in life is the unknown ...................................
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  12. JOE54
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    #12 06-12-2019, 06:30 AM
    on the way
    .................................................. ...the scariest thing in life is the unknown ...................................
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  13. scstarr
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    #13 06-12-2019, 09:38 PM
    Nice !!!!
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  14. blackboat
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    #14 06-17-2019, 08:39 AM
    Joe,received the module. Thanks!!! Check will be in the mail when I get home. It works great,solved the warning at start up of cold motor.The warning still comes on when running.I'm guessing it's the poppet or thermostats. Here's what happens.....Cruising speed,3500 rpm to WOT,no warning.In rough water,2500 to 3500 rpm,warning comes on after a few minutes.Slow down to idle,warning quits after 15 seconds and will run for another few minutes before the warning starts again.2000 rpm or below,no warning.Healthy pee stream in all cases.
    What do you guys think??
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  15. JOE54
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    #15 06-17-2019, 08:43 AM
    what does water psi seem to be doing?????
    .................................................. ...the scariest thing in life is the unknown ...................................
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  16. blackboat
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    #16 06-18-2019, 06:44 AM
    Hate to admit it but no water pressure gauge. I guess I will have to install one if I can figure out which one is right for the motor.The descriptions are kind of confusing.What I'm trying to say is I would appreciate a part number for the right gauge so I can install it and get this deal figured out. Thanks!
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  17. JOE54
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    #17 06-18-2019, 06:50 AM
    just need 30 psi for your v6, would check pump again and popett valve also
    .................................................. ...the scariest thing in life is the unknown ...................................
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  18. leonreno
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    #18 06-18-2019, 09:07 AM
    Look under the starboard head for a small brass plug, that is where you would install a barbed plug and then run the hose to an analog gauge. You can buy them as a kit, any brand will work but if you choose you probably can find one to match your other gauges.
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  19. blackboat
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    #19 06-27-2019, 06:55 AM
    Update...Got all the parts for the poppet.Went to install and found the middle top bolt completely unscrewed and laying in the lower cowl.The other 3 bolts were only finger tight.The old poppet actually looked fine,nothing stuck or damaged that I could see.Installed poppet kit and new thermostats as a precaution.Took the boat out for a test,tried to duplicate warning conditions as best I could.No beep.Anyway,could that missing bolt leak enough to cause the poppet to malfunction and the motor to overheat under the conditions mentioned? Pressure gauge hasn't showed up yet so I don't think I'm completely out of the woods. Thanks!
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  20. EuropeanAM
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    #20 06-27-2019, 09:40 AM
    Doubtful, unless the others were loose also. Any gaskets appear to be distorted into the center passage?


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