ARCO Marine BI-2703 Battery Isolator - 70A - 2 Alternator, 3 Battery [BI-2703]

The Arco Marine BI - 2703 battery isolator is a great choice for your inboard/outboard system. It can handle 2 alternators, 3 batteries, with a maximum current of 70A. It's suitable for 10 - 350 - amp alternators in 12, 24, or 32 - volt negative ground systems. This solid - state device allows current to flow in one direction only. It keeps your batteries charged automatically and proportionally while the engine runs. When used with selector switches, you don't need to change the switch position for charging. It also distributes the charging current to the batteries as needed. Note that it can't be used on 12 - volt charging systems with 24 - volt trolling motors or newer outboard engines with rectifier - regulator charging systems. And this product can't be returned to the original purchase point. Contact the manufacturer for any issues. There's also a Quick Guide (pdf) available.

Using the Arco Marine BI - 2703 battery isolator is easy. First, make sure your system is a 12, 24, or 32 - volt negative ground system with 10 to 350 - amp alternators. Connect 2 alternators and 3 batteries to the isolator as per the instructions. Once the engine starts running, the isolator will automatically charge the batteries in proportion to their needs. You don't have to worry about higher - charged batteries discharging into lower - charged ones. When using it with selector switches, you don't need to change the switch position for charging. However, remember that you can't use this isolator on 12 - volt charging systems with 24 - volt trolling motors or newer outboard engines with rectifier - regulator charging systems. If you have any problems, don't return it to the original purchase point. Instead, contact the manufacturer directly. For maintenance, keep it clean and check the connections regularly to ensure proper operation.