![]() 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. With the engine stationary the isolator relay would isolate the accessory battery from the primary battery system. With the engine running the isolator relay would parallel the primary and accessory batteries. VOLTAGE SENSITIVE RELAY: The KeyLine Automatic 140 Amp Dual Battery Isolator is all you need to charge Two Battery Systems. In a dual battery setup, all accessories required to be powered with the engine stationary would be connected to the accessory battery.It's like having two separate power sources for each battery while only having one alternator! 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 power! The KeyLine Dual Battery Isolator is the only unit designed with cutting edge programming to deliver optimum performance - with ZERO sacrifice.I found the following information on the manufacturer website: The reserve battery system is used for vital loads like engine starting, navigation or communications. Place the VSR close to the main battery and away from any hot or moving parts. 14 off - vehicle, 72 outboard, 11, 12 single engine - dual battery. Battery Isolators, Automatic Charging Relays (also called ACRs, combiners, or voltage sensitive relays) are all intended to keep a load (or loads) from discharging the reserve battery system. Mount the second battery on your rig, ensuring you have enough wire to make the necessary connections to your second battery. It looks like the kit for the isolator came with 7AWG, but the previous owners opted for 4AWG. 55-56 wires, 8-9, 10 battery chargers constant voltage, 70-71 ferro. Locate the supplied wire with the inline fuse, connect the end of the wire with 2 spade terminals to the A3 and B3 terminals on the switch. The keyline charger/isolator was one of the things that was installed when I got my van. Thanks for your feedback! I understand your concern.
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