ARCO Marine BI-3203 Battery Isolator - 120A - 2 Alternator, 3 Battery [BI-3203]

The Arco Marine BI-3203 is a top - notch inboard/outboard battery isolator. It can handle 2 alternators, 3 batteries, with a maximum capacity of 120A. This isolator is suitable for 10 to 350 - amp alternators on 12, 24, or 32 - volt negative ground systems. Key features include: It allows current to flow in one direction only, so you don't have to worry about a higher - charged battery discharging into a lower - charged one. Both batteries get charged automatically according to their needs when the engine runs. When used with selector switches, you don't need to change the switch position for charging. It also proportions the alternator's output current to the batteries as required. Note: It can't be used on 12 - volt charging systems with 24 - volt trolling motors or newer outboard engines with rectifier - regulator charging systems. This product is non - returnable to the original purchase point. Contact the manufacturer for any issues.

Using the Arco Marine BI - 3203 battery isolator is simple. First, make sure your alternators and batteries match the product's specifications (10 to 350 - amp alternators on 12, 24, or 32 - volt negative ground systems). Once installed, when your engine starts running, the isolator will automatically start charging the batteries according to their needs. There's no need to adjust the selector switch if you're using one. Just let the isolator do its job. However, be aware 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. For maintenance, check the connections regularly to ensure they're tight and free from corrosion. If you encounter any problems, don't return the product to the place you bought it from. Instead, contact the manufacturer directly.