1997 Mercury EFI
Alarm beeps when accelerating. Not a constant beep, but a constant beeping. Once the boat planes out the alarm stops. Poppet valve has been checked and and cleared , had a little debris and thought that was the problem. back to the lake and same problem. replaced the thermostats and back to the lake and still have the same problem. Impeller has been replaced and not obstructions were found. Tube from the lower powerhead is clear. Running out of options and things to check.
Any help would be greatly appreciated!!
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