Most likely yes, since he was able to start the engine.So the important question is whether or not at least one of your batteries was selected when the engine was running.
Well if you had the battery selector set to "ALL" and if your boat is wired correctly, then you have nothing to worry about. Your engine has a charging system that generates about 14.5 volts DC to charge your batteries. If it does not have batteries connected to it when it runs then the charging system can be damaged.Thank you much. At the time I did this, I had the selector set to BOTH for all batteries - not sure if that is better or worse!
So the 'bad' part of starting while connected to shore power is what?? if no battery is selected? What is the issue? just for my knowledge.
This is probably a volt meter. If so, you don't need another. Even if it is not marked well, see if the reading with the engine running is higher than the reading without the engine running.... I switched the batteries to all banks (starter and house) and then selected "test" and the power meter went into the green and 'charge' area.
Is this true for all charging systems? What about an outboard with an electric AND rope start, started with a pull and with no battery attached?