06-08-2014, 10:23 PM
I have been specializing in electrical systems for some time, In my the mobility trade we use dual batterys on many projects.
The use of Isolators is common, especially in the rv world. Due to the high amp load of some of the components we use they are not always up to the challenge or may cost too much. My company uses a dual batt system with a constant duty solenoid. If the system is wired as shown you use both batterys when the engine is running but they are isolated when the key is off. Unless the toggle switch was thrown. Then they are connected together. This works well if your winching or running lots of lights. You can rely on the alternator to power everything or shut off the engine (like when you swamped it) and just use the batt wired for the winch. Then you would still have juice to start the truck. Lots of ways to put your loads on this system.
The use of Isolators is common, especially in the rv world. Due to the high amp load of some of the components we use they are not always up to the challenge or may cost too much. My company uses a dual batt system with a constant duty solenoid. If the system is wired as shown you use both batterys when the engine is running but they are isolated when the key is off. Unless the toggle switch was thrown. Then they are connected together. This works well if your winching or running lots of lights. You can rely on the alternator to power everything or shut off the engine (like when you swamped it) and just use the batt wired for the winch. Then you would still have juice to start the truck. Lots of ways to put your loads on this system.