Great replacement for a battery selector switch. Just remove the old selector switch and connect the existing wires to a 716 cluster. No extra wires are needed for a fully-automatic battery management system. No more flat starting batteries! The 716 Cluster is for use on charging systems up to 150 Amps, single outboard, dual battery banks, or a single alternator inboard engine with dual battery banks. Replaces battery isolator systems. Provides electronics protection from harmful engine start spikes.