I have a 2008 Mercruiser 350MAG. Engine SN 1A324453 (sorry long read - new to boating so the terms maybe confusing)
A week before the issue began I had a one-off sys fault "Engine Sensor" but everything was working fine. The problem(s) then started one day after turning the engine off after a day in the water, a long continuous beep alarm with a message that read "Low voltage - Engine Voltage is low - battery !" The engine wouldn't attempt to start at the first, but after turning the batteries off and on a few times, it did start but with bad cranking noise (to flush the engine)
Next day, it started fine but in the water when I switched the batteries to on, the same long beep and the engine wouldn't start for about 10 mins. When the mechanic diagnosed it, the low voltage did not appear (both batteries read 11.4 when off 14.5v when on) but lot of cranking so replaced the starter.
The following week, the engine would only start after a few attempts and the low voltage came back. He figured the start/stop button in the lever was faulty and was cutting off the power to the engine (as when he connected a direct cable to the battery, the engine started right away without cranking) so I need to replace the entire lever and low voltage was due to the solenoid was receiving 14v but only 8v was going to the engine) so he cleaned it and the issue went away.
Few days later, the low voltage issue came back, NOTE - it does not appear when undocking but only when once I turn the engine off in the water. Batteries are 3 months old
Before sending it to the dealer for a proper diagnose, wanted to share the experience for any assistance would be appreciated.
Other one-off alarms I got in the past 2 weeks were "Start system may not start. The starter solenoid is not working properly" and "Start sequence aborted"
A week before the issue began I had a one-off sys fault "Engine Sensor" but everything was working fine. The problem(s) then started one day after turning the engine off after a day in the water, a long continuous beep alarm with a message that read "Low voltage - Engine Voltage is low - battery !" The engine wouldn't attempt to start at the first, but after turning the batteries off and on a few times, it did start but with bad cranking noise (to flush the engine)
Next day, it started fine but in the water when I switched the batteries to on, the same long beep and the engine wouldn't start for about 10 mins. When the mechanic diagnosed it, the low voltage did not appear (both batteries read 11.4 when off 14.5v when on) but lot of cranking so replaced the starter.
The following week, the engine would only start after a few attempts and the low voltage came back. He figured the start/stop button in the lever was faulty and was cutting off the power to the engine (as when he connected a direct cable to the battery, the engine started right away without cranking) so I need to replace the entire lever and low voltage was due to the solenoid was receiving 14v but only 8v was going to the engine) so he cleaned it and the issue went away.
Few days later, the low voltage issue came back, NOTE - it does not appear when undocking but only when once I turn the engine off in the water. Batteries are 3 months old
Before sending it to the dealer for a proper diagnose, wanted to share the experience for any assistance would be appreciated.
Other one-off alarms I got in the past 2 weeks were "Start system may not start. The starter solenoid is not working properly" and "Start sequence aborted"