You know, that little window on the top of the battery which either shows green, black or white according to the state of the battery. How on earth do they work and are they accurate? Mine are showing green but I haven't a clue!
Hitch, I fitted Nasa's BM1 in my motorhome and like to be able to look at actual voltage, charge and discharge currents as well as have an estimate of how much charge is remaining.
mickysf
Motorhomer