How Do You Know If Your Boat Alternator Is Bad. If the stator fails then you wont be charging your boats batteries while you are running. With the key in the on position and NO motor running the meter should read 12 12 volts.
During steps two and three while your car is running if your alternator tests below 134 and your battery tests fine then your alternator is going bad. Watch your volt meter on your dash. Turn your car off pop the hood and connect the voltmeters positive probe to the positive terminal on the battery and the negative probe to the negative terminal on the battery.
It should read 126 volts fully charged.
You would need an idea of the current draw of your boats system while running and youd have to determine the rating of your present battery. If you as a boat owner dont know not to stick your hands into the belt of a running engine by now perhaps youll want to consider a safer pastime. The first step in monitoring your alternator to check the levels is to check the alternator gauge itself. If the reading on the digital multimeter is.
