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Product: KeyLine Chargers 12V 140 Amp Dual Battery Isolator Voltage Sensitive Relay (VSR) Pro Dual Battery Kit Your search for the best automatic battery isolator is over! KeyLine Chargers 140amp Battery Isolator is the best value battery charger on the market.

Zero Voltage Drop. Won't rob precious power from your batteries and electrical system, unlike heat sinking competitors'.

Small Convenient Size. Only about 2 inches tall, wide & deep (2.6" x 2.6" x 2") the isolater fits just about anywhere!

Fast & Easy Installation. Simple power wire IN, power wire OUT install. Comes with mounting plate/template.

IP65 Weather & Strong Vibration Protection. Suitable for all off-road vehicles and weather exposed applications.

Most Efficient Programming in the Business. Ensures your electrical system functions properly and batteries charge accurately.

Voltage Sensitive Relay (VSR). Specially designed for ATV, UTV, boats, RV's, campers, 5th wheels, off road vehicles, Rhino, Polaris, Artic, Cat, Etc.

Comes With Necessary Hardware & Mounting Instructions

Dual Battery Voltage Sensitive Isolator User Guide

Full 1 Year Warranty

When it comes to SMART isolating... There is clear winner. The KeyLine Smart Battery Isolator works perfectly for all of your dual battery vehicles. When you're ready to go, don't get caught with a dead battery or left in the dust by inferior isolators! Do yourself a favor and buy one for a friend or a second vehicle that needs it - You'll thank us (and yourself) for the good decision later.

by KeyLine Chargers ZERO VOLTAGE DROP: Forget the traditional diode relays and so-called "solid state" devices that can rob you of almost 2 amps of output power! The KeyLine Dual Battery Isolator is the only unit designed with cutting edge programming to deliver optimum performance - with ZERO sacrifice. This compact battery isolator was built ultra-small (2.6" x 2.6" x 2") to fit almost anywhere! A perfect fit under the hood to get close to your dual batteries.
VOLTAGE SENSITIVE RELAY: The KeyLine Automatic 140 Amp Dual Battery Isolator is all you need to charge Two Battery Systems. Voltage Sensitive Relay (VSR) cuts in at 13.3 volts and cuts out at 12.8 volts to ensure your primary battery is always charged and ready to start your vehicle. It's like having two separate power sources for each battery while only having one alternator!
RUGGED DURABILITY: Unlike other isolators on the market, the KeyLine Automatic 140 Amp Dual Battery Isolator is IP65 Certified. This International Protection rating means that your KeyLine isolator is safe for use even for your off-road needs in dusty, wet and unexpected extreme weather environments. Great for extreme vibration applications as well.
WHAT YOU GET: (1) 140 Amp Voltage Sensitive Relay (VSR); (1) 20 ft red battery cable; (1) 2ft black ground battery cable; (2) positive brass marine type battery terminals; (1) negative brass marine type battery terminal; tinned copper lugs & heat shrink; cable ties; easy-to-follow instructions. Easy-to-follow directions for the most novice DIYer. Power wire in, power wire out. What could be easier?
BUY WITH CONFIDENCE: Every 140 Amp Dual Battery Isolator is backed by an industry leading 12-month warranty. If you are not 100% satisfied with your purchase, simply take advantage of the No Questions Asked, 30-Day Money Back Guarantee!! KeyLine Chargers Black