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You do not want to charge the 24v batteries with the motor. The ignition switch and bilge pump are normally separate from the accy circuit. switch the
Possibly the horn itself is bad.
I actually have 3. (24 volt trolling motor) two trolling, and then the cranking. And sadly I don't have a battery selector switch, not yet at least.
1993 75HP Merc outboard with oil tank mounted inside the cowling. When the key is turned on there is the usual 3 second beep to let me know the system
That plastic washer at the top of the tube melts on severe overheat.----It then blocks waterflow.---------------Factory replacement is a better material