Bad Alternator?

[TXSurf4]

So quick question before I pull the boat. I ran the boat all weekend and it ran awesome, on Sunday we surfed the early morning golden hour with all the lights on and everything. Around lunch we went to head back to the lift and got a message on the screen saying low battery voltage accelerate to 1500rpm. I was already running 4200 so I new something was wrong. I clicked to the battery voltage and saw it said 11 volts, I kept my speed up and luckily I was able to get back to my dock and get it on the lift. After doing that I tried to crank the boat and as I expected didn’t have enough juice to start. In my gut I said probably the alternator but being that our lake house is 2.5 hrs from our dealer I wanted to exhaust all options. So I pulled the batteries and swapped them both in hopes that I had a weak battery and that would fix it. Well she fired up no problem but the voltage on the screen read 12v so I check my voltage at the alternator using my volt meter on the 2 leads and it read 11.8v which I assume is just the voltage of the batteries in the circuit. So am I correct in my next step of getting my alternator replaced? Or is there something else I should be looking at?


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