A battery monitor is like a gas gauge, showing you how much electrical power is left (known as state of charge) as well as other vital signs. Today adding a monitor to a boat battery is easier than ...

Jesse Rodriguez, Las Vegas, NV. I have a 1970 Mustang hardtop that has been in the family for a long time and now I'm getting my turn at it. My dad used to race it at the drags so we got it running ...