The last time I was out The smart craft beeper went off and was flashing low voltage. I put it on the trailer and came home. I checked all the connections, Battery, Alternator. What else can I check. Possibility of alternator going out. But here is what it was doing. 3000 RPM and under it had around 13 volts. Above that rpm it went to 10.5 to 11 volts.