Same 2007 150 Speedster. Started after recent battery replacement. Checked voltage - while running 13.5 at battery. Not running 12.6. Is 13.5 enough at running, could it be rectifier/regulator? It runs fine not in limp mode, just annoying long loud beep. No engine over temp. No exhaust temp. No coolant temp. No oil or any other warnings. Just the long beep every minute.