Ignitions and Electrical› Charging Systems

ARCO MARINE

BATTERY ISOLATOR 70 AMP MAX

$137.00

SKU: A09I BI-0702-4

In Stock
In Stock
Ships by Jun 14
Free Shipping
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Easy — 1–2 hours

Description

The ARCO Marine BI-0702-4 is a solid-state battery isolator designed for marine applications. It allows current to flow in one direction only, enabling an alternator to connect directly to two batteries without discharge between them. This ensures both batteries are charged automatically and proportionally to their needs when the engine is running. The isolator is rated for 10 to 350 amp alternators and supports 12, 24, or 32-volt negative ground systems, with a maximum capacity of 70 amps.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandARCO MARINE
Part NumberA09I BI-0702-4

Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

View Full Return Policy