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Sierra 18-6851 Battery Isolator 1-Alternator 2-Battery 130 Amp

Manufacturer

Sierra

Picture for manufacturer Sierra

Part Number

18-6851
14 reviews
04/05/2036 8:11 AM
Sale Price

$198.54

4 left at this price

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Usually delivered within 2 days

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Product Details

The Sierra 18-6851 battery isolator enables you to charge two separate battery banks from a single alternator source, making it ideal for marine vessels, RVs, and other applications requiring isolated battery systems. This 130-amp isolator ensures that your starting battery remains fully charged while also maintaining your auxiliary or house battery bank.

Key Features:

  • 130-amp continuous duty rating for reliable performance
  • Charges two battery banks from one alternator source
  • Prevents battery discharge between banks when engine is off
  • Solid-state design with no moving parts for long service life
  • Heat sink construction for efficient thermal management
  • Simple installation with clearly marked terminals

Important Compatibility Note: This isolator is not compatible with Delco "CS" style alternators. Verify your alternator type before installation to ensure proper operation.

Battery isolators are essential for maintaining separate electrical systems, allowing you to run accessories and house loads without risking the depletion of your starting battery. The Sierra 18-6851 provides dependable isolation and charging management for dual-battery configurations.

Products specifications

Amps

130

Application

1 alternator / 2 batteries*

Best prices I've found. Shipping was fast never had any issues bought multiple things from them and do plan on going back.

Great price and fast shipping...took only 2 days to deliver. Very satisfied customer

Didn't see military/LEO discount =(

A few items could have a better description.

easy to find and purchase the item i was looking for

Great!

Website is easy to use.

Easy to navigate, fast shipping and able to get parts that are practically discontinued. Great experience.

Very quick and easy to order. Looking forward to the speedy delivery :)

Not bad price

First time like it so far

Great online experiance

Easy thanks!

Best prices anywhere!!!

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