Please ignore my lazy cable management (i haven't completed the build) Install was easy enough, especially if you have experience with audio equipment. I found this out the hard way so don't make my mistake by buying a simple isolator kit and realizing it won't do what you want it to. It monitors and charges it fully and indepently of your start battery regardless of the alternator output. A DC-DC charger is customized to your auxiliary battery's needs. Some lithium batteries require 15 volts or more to fully charge. When this happens no extra charge is available to your auxiliary battery and in the case of an AGM battery the voltage of 14.6 that is required is never reached. A smart alternator charges your start battery to full then drops off to 12.6 to 12.8 volts until the battery requires more charge. If you have a shunt on you negative start battery post or somewhere on your negative cable then you have a smart alternator and this product will not work for you to it's full potential. I ended up removing the isolator and installing a DC-DC charger from REDARC because I have a smart alternator system and this system won't fully charge my AGM auxiliary battery to full. There is no manual control wire to close the circuit for jumping one battery off the other like some other brands. The isolator cover has 4 knockouts in the cover to alow wire to go through the sides however none of them line up so you have to make your own holes. The product works as it should and installing it was easy. The positive is only 7 gauge wire and should be thicker but they give you 20 feet of it. Plenty of wire although the ground wire could be longer. If you are not 100% satisfied with your purchase, simply take advantage of the No Questions Asked, 30-Day Money Back Guarantee!! BUY WITH CONFIDENCE: Every 140 Amp Dual Battery Isolator is backed by an industry leading 12-month warranty.Easy-to-follow directions for the most novice DIYer. 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.Great for extreme vibration applications as well. 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. RUGGED DURABILITY: Unlike other isolators on the market, the KeyLine Automatic 140 Amp Dual Battery Isolator is IP65 Certified.It's like having two separate power sources for each battery while only having one alternator! 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. VOLTAGE SENSITIVE RELAY: The KeyLine Automatic 140 Amp Dual Battery Isolator is all you need to charge Two Battery Systems.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. ZERO VOLTAGE DROP: Forget the traditional diode relays and so-called "solid state" devices that can rob you of almost 2 amps of output voltage! The KeyLine Dual Battery Isolator is the only unit designed with cutting edge programming to deliver optimum performance - with ZERO sacrifice.This international level of protection means that your keyline isolator can be used safely even in dusty, humid and unexpected extreme weather conditions. Rugged: No voltage drop compared to Battery Isolator diode (0.6V).Comply with ISO8846 ignition protection standard and apply to engine room. It's like each battery has two separate power supplies and only one alternator The voltage sensitive relay has an on voltage of 13.3 volts and an off voltage of 12.8 volts to ensure that the main battery is always charged and ready to start the vehicle. Voltage sensitive relay: key line automatic 140 amp dual battery isolator is all you need to charge both battery systems. Perfectly fit under the hood to access the dual battery. This compact battery isolator is ultra small (2.6 "x 2.6" x 2 ") and can be installed almost anywhere Dual battery isolator is the only intelligent device with cutting-edge programming design, which can provide the best performance - zero sacrifice.
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