GMC Sierra Dual Battery Kit

GMC Sierra Dual Battery Kit 12V 140AMaximize your GMC Sierra’s power potential with the 12V 140A Dual Battery Isolator Kit. Engineered specifically for the high-demand electrical systems of GM trucks, this kit allows you to run winches, auxiliary lights, and portable fridges without the risk of draining your primary starting battery.Smart Voltage Management:The 140A Voltage Sensitive Relay (VSR) automatically engages at 13.3V to charge both batteries while the engine is running and disengages at 12.8V when the engine is off to isolate the starter battery.Propriety Efficiency ProgrammingThis 9th generation 12v heavy-duty GMC Sierra dual battery kit is a superior product that uses a very unique designed and programmed SBI (PEP) when it comes to dealing with the stator charging mechanism.Trusted by Leading Brands A TRUE®  exclusive!Here are Some of the True® GMC® Sierra Dual Battery Kit AdvantagesIt is assembled in America and delivers through first-class mail.It has advanced specific internal programming for maximum efficiency with automotive stators. (PEP) Its new case was introduced last April 2019 specifically designed for automotive application. It has a superior cable construction with 100 % waterproof shrink tube.It offers extra flex cables for easy routing. It assures correct cable ends to custom fit isolator studs.The new smart GMC Sierra dual battery kit can be left suspended in-line, as long as it is mounted with provided 3M Dual Lock™, or hard mounted with any provided screws.It is compatible with all battery types like dry cell, flooded lead-acid, AGM, and any hybrid. With its upgraded features, the TRUE® Smart 12v isolator switch is specifically designed and programmed for automotive and marine application, plus it is 100% American-made.An Important Note from the Designer:Together with PEP (Propriety Efficiency Programming), the all-new TRUE® isolator kits have added lots of upgrades which include the case design, circuit board design, and the type of cables that should be used in order to avoid insulation and terminal failures from possible corrosion. Overall, its main goal is to provide stable and easy installation. The construction of the actual 12v GMC Sierra dual battery kit case has been exclusively redesigned for automotive application which then allows a hassle-free and versatile installation. There are possible cable access slots that need to be “knocked out” because it may cause a breach in the seal protecting the circuit board, which is why the front mounted studs are there to eliminate unnecessary holes.Now, we made sure to move all our production processes as possible to America. These improvements made huge impacts that are essential for the benefit of all because we only aim to provide the best and most efficient products that fit the standards and demands of a vehicle’s owner. True is a heavy-duty and universal dual battery kit for Sierra, Yukon, Terrain, Canyon, Acadia, Sabana. Yes all GMC® motors are fit for the True® brand.“The TRUE® 12v battery isolator switch is the 9th generation I have designed. The first-generation products which I have designed before I figured the proper programming include the QUAD BOSS/AOPEC/Keyline units.”Dennis M. Hogan, Ph.D.TrueAm Inc. eBay top-rated sellerOne of eBay’s most reputable sellers, consistently delivers outstanding customer service.Amazon Ratings: 4.8 out of 5 Reflecting consistently high satisfaction and positive reviews from Amazon buyers. Testimonials from Our Amazon StoreFrequently Asked Questions Does installing this kit void my factory warranty? No. Because this is a non-intrusive “straight-to-battery” connection, you aren’t tapping into the fuse box or cutting factory wires. It functions as an independent add-on, keeping your factory electrical system intact. Why does the LED stay on after the engine is turned off? This is normal behavior. The LED indicates the isolator is still connected. To test disconnection, briefly turn on the headlights—the LED should turn off, confirming the isolator has opened the circuit. Do I need to run a ground wire from the auxiliary battery to the main battery? Yes, it is highly recommended. On modern GMC/Chevy trucks with a current sensor on the negative battery terminal (often on the starting battery), you must connect the negative terminal of the auxiliary battery directly to the negative terminal of the starting battery. Failing to do this can cause the truck’s voltage regulator to cut alternator output, leading to undercharging and premature battery failure for both batteries. Can I mount it without drilling holes? The kit works with most 12V battery types (AGM, gel, standard lead-acid). It is not recommended for lithium batteries unless specified. Is the isolator waterproof/durable? Yes, the isolator features an IP65 rating for water, dust, and vibration resistance, making it ideal for harsh automotive, marine, or off-road environments. What is P.E.P.® (Proprietary Efficiency Programming)? P.E.P.® is TrueAm’s smart logic that optimizes battery protection and charging efficiency.It ensures the isolator only connects when safe and beneficial for both batteries Does it regulate charging amps? No, the SBI doesn’t regulate amperage. That’s handled by your alternator and voltage regulator.The SBI simply controls when the second battery is connected based on voltage thresholds. Can I manually override or shut it off?  The male connector underneath can be wired for remote shutoff.Inline switches are optional but not required—SBI handles disconnection automatically. How do I monitor battery status?  Optional Single Meter Dual Display (SMDD) shows real-time voltage for both batteries.Saves space and simplifies monitoring Is it compatible with all batteries? It’s designed specifically for Chevy Silverado and GMC Sierra trucks, but can also be adapted for other GM vehicles with similar 12V systems