Trusted by Leading Brands A TRUE® exclusive! How the True® Dual Battery Install Kit WorksThe 12v dual battery system kit utilizes the simplest and most advanced technology to keep all your batteries charged using the engine’s electrical system but isolating the starting battery so you never get stranded.The True® dual battery install kit uses the same voltage-sensitive relay we have installed in our boat and camper to keep the secondary batteries charged but isolating the starter battery system so it stays charged. The great thing about these is that you don’t have to reroute any alternator wires and they switch charging automatically.The best dual battery system kit allows a safe charging and separation of starting and auxiliary batteries in all types of boats, RVs, 4WD, camper, truck, caravan, and even solar applications. When the engine is started, starting and auxiliary batteries are separated allowing only the starting battery to be charged. When the charge voltage reaches 13.3 volts the voltage-sensitive relay engages allowing both the starting and auxiliary batteries to be charged.This is indicated by the light in the top LH corner being illuminated.When the engine is stopped and the battery voltage falls below 12.8 volts the (VSR) Voltage-sensitive relay disengages separating the start and auxiliary batteries, at this point, the indicator light will be out and the True® best dual battery cable kit continues to power any accessories without risk of draining the starting battery. True® Smart Battery Isolator Kit sensing featuresThe (VSR) voltage-sensitive relay also has dual sensing technology which detects the charge of both batteries. If either battery is receiving a charge, e.g. a battery charger is connected to the secondary battery; the VSR will engage and charge both batteries. True® technology is known for 12v dual battery system kit heavy-duty performance.The True® 12v dual battery cable kit is easy to install and comes with all components and instructions required to complete the install. There is no need to cut into any factory wiring that may void your vehicle’s manufacturer’s warranty.Using a True® dual battery kit for trucks and boats, vehicle owners can ensure a more efficient and reliable power distribution system for their vehicles. Testimonials from Our Amazon Store Frequently Asked Questions How does the Smart Battery Isolator work? The SBI uses voltage-sensitive technology to automatically connect or disconnect the auxiliary battery based on system voltage. It: – Combines batteries when charging (above 13.3V) – Separates them when voltage drops (below 12.8V) This protects your starting battery from being drained by accessories. Is ignition or alternator wiring required? No. The True® SBI does not require ignition or alternator wire rerouting, preserving the integrity of your vehicle’s factory electrical system. What vehicles is this kit compatible with? It’s designed for 12V systems and works with most trucks, vans, SUVs, RVs, and marine setups. Popular applications include GMC Sierra, Toyota Tundra, Ford F-Series, and Jeep builds.
