Description
4Runner Dual Battery Kit Includes:
- 1 (SBI) Original True® Smart Battery Isolator with mounting screws
- 20 feet #6 high flex red cable with tinned copper cable lugs
- 3 feet #6 high flex black cable with tinned copper cable lugs
- 2 positive brass alloy battery terminal ends
- 1 negative brass alloy battery terminal end
- 3 loose crimp-on tinned copper cable lugs
- 2 sections of adhesive lined shrink tube
- 5 zip ties
- 1 installation manual
- 1 dual battery wiring kit diagram
- See our terms of service, shipping, return, and warranty policies!
- Delivery: USPS priority mail
Product features
Either you’re supplying extra devices, providing auxiliary lights, or operating heavy-duty equipment, this 5th Gen 4runner dual battery kit has the electrical capability you need to keep your Toyota going smoothly.
🔋 Smart Power Control
- PEP® Technology – Optimized for stator charging systems.
- Voltage-Sensitive Relay (VSR) – Engages at 13.4V, disengages at 12.9V.
- Dual Sensing – Charges from either battery source.
- Zero Voltage Drop – Maintains full power flow.
- Automatic Isolation – Protects starter battery from accessory drain.
- Ignition Surge Protection – Shields sensitive electronics.
- 10-Second Delay Logic – Prevents false engagement/disengagement.
⚙️ Heavy-Duty Build
- 140A Continuous Rating – Handles high-demand accessories.
- 170A Intermittent Rating – Supports short bursts of heavy load.
- Waterproof Housing – Built for wet environments.
- Shockproof Design – Resists vibration and rough terrain.
- Heat Resistance up to 130°C – Performs in extreme conditions.
- Brass Alloy Terminals – Durable and corrosion-resistant.
- UL1107/UL1500 Certified – Meets marine-grade standards.
🧰 Installation & Compatibility
- Plug-and-Play Setup – No alternator wire cutting required.
- Compact Size (2.7″ x 2.7″ x 1.95″) – Fits tight spaces.
- LED Indicator – Blue light shows battery connection status.
- 3M Dual Lock™ Mounting – Flexible install options.
- No Fuse Required – Built-in protection simplifies wiring.
- Works with All 12V Systems – Compatible with most vehicles.
- Preserves Factory Warranty – No invasive wiring changes.
- Clear Wiring Diagram Included – Easy DIY setup.
🚙 Versatile Applications
- Ideal for UTVs, RVs, Boats, Trucks, Campers – Multi-platform use.
- Supports Winches, Fridges, Lights, Sound Systems – Powers all essentials.
- Reliable for Remote Expeditions – Trusted by overlanders.
- Compatible with AGM, Gel, Lead-Acid Batteries – Wide battery support.
- Not for Lithium Batteries – Ensures safe operation with standard setups.
🇺🇸 Brand & Trust
- Made in the USA – Built in Washington State.
- TrueAm Quality – Trusted by professionals and enthusiasts.
- Proven in Harsh Environments – Field-tested for durability.
The True® 4th gen 4runner dual battery kit comes with all necessary mounting hardware, allowing for easy secure installation. It works with dry cells, flooded lead-acid batteries, AGMs, and hybrids.
A TRUE® exclusive!
How the True® 4Runner battery isolator works
1. Separation of Functions: Typically, one battery is used for starting the engine (the starter battery), and the other is used for powering auxiliary devices, such as lights, radios, refrigerators, and other electronic devices when the engine is off. The 4th gen 4runner dual battery kit ensures that the starter battery remains fully charged and unaffected by the drain from auxiliary devices.
2. Simultaneous Charging: When the engine is running, the alternator generates electricity, which the 5th gen 4runner dual battery kit then uses to charge both batteries. However, it prioritizes the starter battery to ensure it is always fully charged and ready to start the engine. Once the starter battery is fully charged, the isolator then directs charge to the service battery.
3. Prevent Battery Drain: Without a True 4runner battery isolator, using auxiliary devices could potentially drain the starter battery, leaving you unable to start the vehicle or boat. The isolator prevents this by ensuring that only the service battery is used for auxiliary power.
4. Optimal Charging: True® dual battery isolator for 3rd, 4th, 5th 4runners are designed to manage different types of batteries that may have different charging needs. They ensure that each battery receives the correct charge required to maintain its health and longevity.
5. Safety and Reliability: By separating the batteries and managing their charge independently, (3rd,4th,5th,SDHQ) 4runner dual battery kit improve the overall safety and reliability of the vehicle’s electrical system. This setup helps in reducing the likelihood of electrical failures and extends the life of the batteries.
CUSTOMER PHOTOS AND VIDEOS
(These videos are not endorsed or represented as an “Official Installation video” by True Amalgamated and True Amalgamated accepts no responsibility for its content. It is produced by the end-user as stated. Follow entirely at your own risk.)
2019 GM dual battery setup video
Truck and car battery isolator switch installation video
2500hd dual battery kit installation video
Kenny Storkie –
For my fourth-generation Toyota 4Runner, I purchased these truck battery isolators. The main concern with this product is the voltage-sensitive relay. For my auxiliary battery, I used a stock battery hood-down kit and 1/4″ eye bolts.
I discovered that the relay was not functional during the initial installation.
Change the relay’s battery leads if this occurs to you. The back of mine has a mistaken label. Make sure the ground line is securely fastened to the relay. It operates perfectly, and I’m very happy about that.
Eli Patterson –
Installed easily and comes with simple instructions. Does an excellent job of keeping my backup battery charged. It also features a relay that reverses the flow of electricity to your main battery, which works quite well. It’s nice to know you can jump start yourself.
Aaron Watkins –
I require a lot of power in my Toyota Tundra for business. My main starter battery has dropped too low to start several times. The True Smart Battery Isolator resolves the issue. The only thing I would change is to acquire a package with an additional 6′ of power wire.
Martin Ward –
Great Toyota dual battery system! I placed a second 100 amp Renogy AGM battery with an inverter, cigarette lighter, and USB ports in the back of my Tundra truck roof. Easy to wire, with excellent directions.
Hector Ward –
It’s not too complicated since it accomplishes what it’s supposed to do. I drove 1700 miles in my Tundra with peace of mind considering that I kept my second battery ready in case of a problem.
Marlin Ward –
It works well after a quick installation to my , and the manufactuirer should spend in research and development. My 2018 Toyota 4runner requires somewhat more application than what the instructions specify.
Felandia Green –
I purchased a smart battery isolator for my fourth-generation Toyota 4Runner, making it the centerpiece of my design. To secure the auxiliary battery, I used 1/4-inch eye bolts in conjunction with a factory battery hold-down kit.
During the initial installation, I encountered an issue with the relay—it was not functioning. If you experience a similar problem, check the battery leads on the relay; in my case, they were mislabeled on the reverse side. Additionally, ensure that the ground cable is securely connected to the relay.
Once everything was properly set up, the system operated flawlessly. I couldn’t be more pleased with its performance!