This is indicated by the light in the top LH corner being illuminated. When the charge voltage reaches 13.3 volts the voltage-sensitive relay engages allowing both the starting and auxiliary batteries to be charged. When the engine is started, starting and auxiliary batteries are separated allowing only the starting battery to be charged. The best dual battery system kit allows a safe charging and separation of starting and auxiliary batteries in all types of boats, RVs, 4WD, camper, truck, caravan, and even solar applications. The great thing about these is that you don’t have to reroute any alternator wires and they switch charging automatically. The True® dual battery install kit uses the same voltage-sensitive relay we have installed in our boat and camper to keep the secondary batteries charged but isolating the starter battery system so it stays charged. The 12v dual battery system kit utilizes the simplest and most advanced technology to keep all your batteries charged using the engine’s electrical system but isolating the starting battery so you never get stranded.
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