Description
Trusted by Leading Brands
A TRUE® exclusive!
Built for Adventure & Durability
- Heat-Resistant Engineering — Perform reliably in extreme conditions, withstanding temperatures up to 130°C (266°F)
- Anti-Vibration & Corrosion Proof — Build with vibration-proof housing ready for off-road jolts and coastal conditions alike.
- Compact Design with Optimized Cable Length — Allow the Silverado dual battery isolator kit to fit with old and new truck models (Silverado 1500 WT, LT, RST, LTZ, High Country, Chevrolet Silverado 1500, 2015, 2016, 2017, 2018, 2018, 2019, 2020 and the latest 2021 model.)
- Engineered for Chevy Silverado® & GMC Sierra® — The best dual battery isolator kit delivers reliable dual battery performance in rugged conditions.
- Maintenance-Free Operation — Once installed, it just works—so you can focus on the journey, not the gear.
"I run a 2021 Chevy Silverado with dual batteries, a winch, and a sound system with a large speaker setup that hits hard. Before installing the True® Large Battery Isolator, I was always second-guessing my setup—especially during long job sites or weekend overlanding trips.
This isolator changed everything. It automatically manages the charge between my starter and auxiliary batteries without me lifting a finger. No switches, no worries. I can run my gear all day and still fire up the truck without hesitation.
Install was clean, and the unit feels built for real-world abuse. If you’ve got a Silverado and serious power needs, this isolator is the upgrade you didn’t know you needed—but won’t want to live without."
This isolator changed everything. It automatically manages the charge between my starter and auxiliary batteries without me lifting a finger. No switches, no worries. I can run my gear all day and still fire up the truck without hesitation.
Install was clean, and the unit feels built for real-world abuse. If you’ve got a Silverado and serious power needs, this isolator is the upgrade you didn’t know you needed—but won’t want to live without."
Austine Jones
Arizona
Frequently Asked Questions
1. 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
2. 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.
3. How do I install it?
- DIY-friendly with waterproof cables, 3M Dual Lock™ fasteners, and clear wiring diagrams.
- Can be mounted on any clean flat surface—including directly on the battery case
4. 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.
5. How do I monitor battery status?
- Optional Single Meter Dual Display (SMDD) shows real-time voltage for both batteries.
- Saves space and simplifies monitoring
2019 GM dual battery setup video 
Charles Tanner –
The most difficult part of the whole procedure was locating a hold down of the suitable size for the second battery!
Allen A. –
It works perfectly and is well-made. I keep two 6v batteries charged in the utility bed of my truck.
Timothy-amazon –
Reviewed in the United States on August 20, 2020
Verified Purchase
This True dual battery kit worked great. My expectation is met right after installation.
I need this for a Silverado led lights that badly needed an auxiliary battery.
4 people found this helpful
Carlton Viens –
Easy to install, instructions give the wrong size for the pilot holes for the mounting screws, but i understand this kit is trying to fit with all different Silverado models. Only installed it today so let’s see if it’s works and lasts as long as I need it to.
Luke Lewis –
WORKS GREAT
Reviewed in the United States on September 2, 2020
Verified Purchase
Amazed the way how it works. the first day it rescued me from being late to work. I regulary forgot to turn off my inverter the night I hooked it up. the next morning I was walking to my truck and heard a low beeeeping sound and knew I had forgot to turn it off. I WAS READY TO CALL THE OFFICE BUT DECIDED TO TRY AND CRANK IT UP. I was so surprised and HAPPY.
ct-milley –
Easy install for novice electronics tinkerer
My only dislike is that the numbers on the dual volt meter are upside down compared to the label like the painted on labels were done incorrectly.
Patrick LeFarth –
With the exception of the wire loom, this package provided everything I needed to install a second deep cycle AGM battery in my pickup. The smart batter isolator, which I wasn’t familiar with, seems to be functioning properly.
Directions on the package are accurate.
Eugene Concklin –
Very easy installation couldn’t have ask for easier direction
Reviewed in the United States on August 18
Judd Dare –
Worked fantastic to add second battery to my 97 chevy suburban k1500
Wired it up on my 97 chevy suburban k1500 to add a second battery. Went well. Added appropriate length cables to mount this against the firewall. Will be adding light bars etc.
Nate-G –
The truck dual battery kit is well put together with great instructions. You do need a heavy duty crimping tool for the two eyelet lugs. Did the testing that instructions said to do and everything appears to be working as it should. We’ll see how it goes when I plow snow next time. Should take a significant load off my main starting battery and electrical system. 2012 Chevy Silverado 5.3L 1500
Robert Loucks –
Comes with everything you need to do the job. Hardest part is figuring out best way to wire it.
Reviewed in the United States on March 12,
Jack Lopez –
I was seeking for a high-quality relay to isolate an auxiliary battery in my Chevy pickup. My original equipment manufacturer relay failed, but it was 30 years old. The auxiliary battery serves as one of two batteries for my truck camper, the other being in the engine compartment. I tested three different isolation relays, two of which appeared to be enough. Because it drew the least amount of current when engaged, the TrueAm battery isolator was the best.
Albert Drew –
Initially, we are discussing how to wire automobiles with high-amperage batteries. It’s really simple to install if you’re already at ease with that. Each and every part was present. The instructions worked as intended. Functions flawlessly. I’ve had to use it several times because my starting battery died. It’s amazing that I put off adding for so long. It is lacking in warranty documentation.
Vincent Hizon –
If you’re utilizing two separate batteries, this is the device you should have. The voltage separation between the power source and charging phases is excellent. Installing it is simple. It is well-made and quite robust. Strongly advised.
James Caleb –
I would strongly advise you to conduct thorough research before installing a secondary battery setup in your truck, but other than that, this kit included almost everything I needed, which I had to buy separately. Everything else functioned flawlessly, and it was well worth the money. I would definitely buy it again.
Brian Mac –
My Silverado needs a lot of power for my profession. My primary start battery has repeatedly dropped too low to turn on. This smart dual battery isolator fixes the issue. Getting a isolator kit with an additional 6′ or so of power cable would be the only thing I would change.