Wirthco 20092 Battery Doctor 125 Amp/150 Amp Battery Isolator

150 Amp Battery Isolator
Water resistant - suitable for marine use (IP62)!
Priority charging for starting battery.
Includes mounting bracket that houses the 4&quote;x4&quote;x2&quote; Isolator.
Over current and surge protected for vehicles with electronic systems.
Manual override for starting battery.
Automatically charges auxiliary battery.