warning buzzer

(blkchevy) · (blkchevy) **Join Date: Jun 2008** 07-26-2011, 9:34 PM

Need help or any info my 06 supreme has a warning horn going off about every 3 to 5 minutes its two beebs then done. Temp gauge is 175 deg. oil pressure is normal no other signs of problems. I did just change the starting battery because the old one failed. trans lube full V drive oil full it has a Faria gauge & it shows only 11.4 volts I cant find any shop manual on this engine its a mercury 5.7 black scorpion that shows this warning horn or what it does any help will be great!

(wake_upppp) · (wake_upppp) **Join Date: Nov 2003** 07-27-2011, 7:40 AM

Have it scanned and see what code it is throwing and diagnose from there. The shop manuals are available direct from Mercury.

(migs)

what year is your supreme? When I had my 06 V220, there was a recall on some sensor that kept sounding that same alarm. Brought it in, they swapped the sensor and I was all set.

(blkchevy) · (blkchevy) **Join Date: Jun 2008** 07-27-2011, 1:49 PM

it is an 06 i think it is a low voltage error the altinator only shows 11.5 volts .But if you can remember the sensor you had replaced that would help if it's not a voltage problem

(migs)

Sorry man no clue what the sensor was called or which one it was.

(blkchevy) · (blkchevy) **Join Date: Jun 2008** 07-27-2011, 3:42 PM

Thanks anyway should have alt back on friday hopefully it works or it's a weekend of yard work!!

(mrbrian) · (mrbrian) **Join Date: Feb 2007** 07-27-2011, 4:07 PM

Chuck most of the newer boats have a low voltage threshold warning that comes on at 11.5 volts to warn against damaging the computer. That is most likely what it is.

(wakebrdjay) · (wakebrdjay) **Join Date: Apr 2008** 07-27-2011, 4:24 PM

I had this problem on my '07 V 212,it ended up being the computer(ECU).I hope yours is a sensor,computer costs $1500.00

(calaman) · (calaman) **Join Date: Apr 2007** 08-05-2011, 6:37 AM

Agree with Brian - Have a 21v that threw the "check engine" error due to low voltage, which i thought was 11.3 on my boat. Your boat computer is like a windows computer - it needs some battery to gracefully shutdown, store engine run time, and other factors into memory. likley you'll have an alarm at the first stage and if it drops lower, around the 10.2 mark, the engine may shut off so the computer can shutdown (with some battery life to protect it). not sure if all boats have the engine shutdown limit or what the voltage is...but that is what mine will do.

(blkchevy) · (blkchevy) **Join Date: Jun 2008** 08-05-2011, 9:35 AM

so far i had the alternator rebuilt the regulator had gone bad and was over charging.I am replacing the battery isolater and should be on the water all weekend.