Ignitions and Electrical› Charging Systems

SIERRAMARINE

BATTERY ISOLATOR

$396.73

SKU: S08C 18-6854

Special Order
Special Order
Ships in 4–6 weeks
Free Shipping
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Easy — 1–2 hours

Description

The Sierra 18-6854 Battery Isolator is a robust solution for managing power distribution from a single alternator to three batteries, handling up to 160 amps. It features a diode-based design for automatic, one-way charging, preventing cross-drainage and ensuring reliable power for marine, RV, and off-road applications. This compact and durable unit is built with corrosion-resistant materials, making it ideal for harsh environments.

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

BrandSIERRAMARINE
Part NumberS08C 18-6854

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.

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