I have an unused, never installed Blue Sea ML-ACR automatic dual battery isolator-combiner for sale. Asking $125 shipped in the con-US.
This is model #7622 for 12V systems. Like most units on the market, it automatically connects a "house" or auxiliary battery with the alternator is running, then isolates that aux battery when the engine is not running to preserve your starting battery. This model comes with the manual isolate/combine & lockout switch on top and also includes a switch that can be installed in your console to manually combine or isolate your batteries if needed.
Includes the original blister pack box, installation guide, and switch.
This is model #7622 for 12V systems. Like most units on the market, it automatically connects a "house" or auxiliary battery with the alternator is running, then isolates that aux battery when the engine is not running to preserve your starting battery. This model comes with the manual isolate/combine & lockout switch on top and also includes a switch that can be installed in your console to manually combine or isolate your batteries if needed.
Includes the original blister pack box, installation guide, and switch.