Automatic 12v battery isolator7/27/2023 ![]() In position 2, the rear battery would be disconnected from the main battery so it could not discharge it but the rear battery wouldn't be able to be recharged. In position 2, the amplifiers would be fed from the rear battery. When in the '1' position, the amplifiers would be fed from the engine starting battery. When in the 'ALL' position, all batteries would be connected together and also connected to the main power wire for the amplifiers. The rear/auxiliary battery would be connected to the remaining terminal. The engine starting battery would be connected to one of the other terminals. If this were used for car audio, the common would be connected to the main power wire that feeds the amplifiers. Terminals 1 and 2 are connected to batteries. In its most commonly used wiring configuration, the common wire feeds the starter for the boat's engine. The common terminal is the one that gets connected to the other terminals. Terminal 1, terminal 2 and a common terminal. The back of this switch has 3 connections. When needed, the power can be cut to the amplifiers and locked out so that the driver cannot damage the speakers. The locking version of this switch and the previous switch are good choices for people who have expensive, powerful amplifiers and speakers in vehicles which others are allowed to drive. It's also available with a key to allow you to lock it. There are also options to break the connections to the field windings to the alternators but this one doesn't have that option. The one below can switch between two individual batteries, both batteries at once or can break the connection to the batteries completely. This type of switch comes in several configurations. This is a term used to many of the switches of this type, no matter the manufacturer. Most of those who use an isolator for marine applications have heard the Term Perko Switch. In this particular model, the 'key' is removable. As long as you don't mind having to manually flip the switch and can remember to do so, this is a good, simple solution. In one position, the batteries are connected. To use a battery disconnect switch like the one below to protect the starting battery from being discharged, you would simply connect it in series with the wire that connects the front and back batteries. The most basic isolator is simply a heavy duty switch (generally rated for at least 100 amps of current) that is used to make/break the connection between the batteries. This type of isolator is slightly more complex to install than the most basic types of isolators. ![]() ![]() Most people opt for isolators that require no action on their part to keep the starting battery from being discharged. A battery isolator will let you completely discharge one battery without discharging the starting battery. This often leads to dead batteries and a vehicle that won't start. BUY WITH CONFIDENCE: Every 140 Amp Dual Battery Isolator is backed by an industry leading 12-month warranty.Many people listen to their stereo or use accessories (lights, radio, TV, computers, for those with RVs) without the engine running.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 power! The KeyLine Dual Battery Isolator is the only unit designed with cutting edge programming to deliver optimum performance - with ZERO sacrifice.
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