Pollak 7-Round To 4-Flat Flex Trailer Wiring Connector Adapter 12-743E 19-2839

It allows conversion of 7 way round to a 4 way flat flex connector. Works with P-type alternators to provide smart, multi-stage regulation and optimal charging voltage for all types of marine battery. Turns your engine alternator into a powerful three-stage battery charger. Selectable charging programs for gel, AGM and optima deep-cycle flooded.