A smart isolator is the ultra-simple and most technologically advanced method of automatic battery isolation. These units can be installed between batteries with a common ground to automatically control the charging process to the batteries but continue to provide isolation when a charging source is unavailable.
The small size and rugged construction of these units allow for quick simple installation for even the most novice DIYer.
The smart isolator is also Dual Sensing which senses the charge of both batteries. If either battery is receiving a charge, e.g. a battery charger is connected to the auxiliary battery; the relay will engage and charge both batteries. The advanced technology always insures that the first battery is fully charged (13.3v) before connection is made to the second battery. This prevents problems that may result from your charging source being too low in amps to charge all batteries as once.
If placed in linear sequence between each battery the isolator units can provide proper charging for several batteries in a multiple battery setup such as in larger boats that may have 2 or more house batteries.
How it works: The smart isolator allows two batteries to be charged at the same time. When the engine is started and either battery reaches 13.3 volts, the relay engages, allowing two battery banks (start and accessory) to be charged simultaneously. When the voltage drops below 12.8 volts (eg the engine is stopped), the relay disengages, separating the batteries.
This system eliminates the possibility of draining the start battery and protects sensitive electronic equipment powered from the house battery from harmful engine start up spike.
FEATURES
12V 140A smart isolator with Cut-In:13.3V, Cut-Out:12.8V. LED Status Indicator
Easy to Install! Easy 3 wire connection at the battery. No need to bypass existing alternator wiring
The smart isolator has no voltage drop. Conventional diode isolators incur a minimum of 0.6 volt drop
Compact 2.5 inch by 2.5 inch by 2 inch size - No large heat sink
IATF16949-2016 Certified. Designed for Dual Battery Systems, Suitable for most 12V charging systems. Surge Protection.
Returns Policy
You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Shipping
We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
Need help before or after you order? We’ve got you covered.📩Questions? Visit the Contact Us page for details on how to contact a customer service representative.
Free Shipping
30-Day Guarantee
DOT/SAE/FMVSS Certified
Premium Quality Truck Parts
DOT/SAE approved for road-legal use
5-conductor, color-coded wiring
14 AWG copper-clad aluminum conductors
Durable insulated outer jacketA smart isolator is the ultra-simple and most technologically advanced method of automatic battery isolation. These units can be installed between batteries with a common ground to automatically control the charging process to the batteries but continue to provide isolation when a charging source is unavailable.
The small size and rugged construction of these units allow for quick simple installation for even the most novice DIYer.
The smart isolator is also Dual Sensing which senses the charge of both batteries. If either battery is receiving a charge, e.g. a battery charger is connected to the auxiliary battery; the relay will engage and charge both batteries. The advanced technology always insures that the first battery is fully charged (13.3v) before connection is made to the second battery. This prevents problems that may result from your charging source being too low in amps to charge all batteries as once.
If placed in linear sequence between each battery the isolator units can provide proper charging for several batteries in a multiple battery setup such as in larger boats that may have 2 or more house batteries.
How it works: The smart isolator allows two batteries to be charged at the same time. When the engine is started and either battery reaches 13.3 volts, the relay engages, allowing two battery banks (start and accessory) to be charged simultaneously. When the voltage drops below 12.8 volts (eg the engine is stopped), the relay disengages, separating the batteries.
This system eliminates the possibility of draining the start battery and protects sensitive electronic equipment powered from the house battery from harmful engine start up spike.
FEATURES
12V 140A smart isolator with Cut-In:13.3V, Cut-Out:12.8V. LED Status Indicator
Easy to Install! Easy 3 wire connection at the battery. No need to bypass existing alternator wiring
The smart isolator has no voltage drop. Conventional diode isolators incur a minimum of 0.6 volt drop
Compact 2.5 inch by 2.5 inch by 2 inch size - No large heat sink
IATF16949-2016 Certified. Designed for Dual Battery Systems, Suitable for most 12V charging systems. Surge Protection.
Returns Policy
You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Shipping
We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
Need help before or after you order? We’ve got you covered.📩Questions? Visit the Contact Us page for details on how to contact a customer service representative.
Durability You Can Depend On. Mile After Mile
Flexible in the cold. Tough in the heat. Tested to outperform cheap imports.
All Star Trailer Cable
For high performance
Cold-weather flexibility down to -40°C
Prevents cracking and kinks in harsh winter conditions
Sealed outer jacket resists UV, salt, and abrasion
Built to withstand road salt, sun exposure, and rough handling
Color-coded for error-free installs
Saves time in the shop — no guessing, no mistakes
Built for commercial-grade use and long hauls
Trusted by fleet managers and owner-operators nationwide
FMVSS 108 Compliant
Waterproof Tested
Professional-Grade
Free Shipping
30-Day Guarantee
DOT/SAE/FMVSS Certified
Premium Quality Truck Parts
Free Shipping
30-Day Guarantee
DOT/SAE/FMVSS Certified
Premium Quality Truck Parts
Free Shipping
30-Day Guarantee
DOT/SAE/FMVSS Certified
Premium Quality Truck Parts
Trusted by 100,000+ Drivers Nationwide
Real trucks. Real results. See how pros stay compliant with All Star parts.
"Passed inspection with no issues."
Been using these lights for 6 months now. Bright, durable, and passed DOT inspection first time. Exactly what I needed.
"Still bright after two winters."
Quality is outstanding. These lights have survived two brutal winters and still shine like new. Worth every penny.
"Good quality and fast shipping."
Ordered on Monday, arrived Wednesday. Good quality parts at a fair price. Will definitely order again.
"Good quality and fast shipping."
Ordered on Monday, arrived Wednesday. Good quality parts at a fair price. Will definitely order again.
Why Drivers Choose All Star Over Others
See how we stack up against generic imports and OEM brands.
|
Feature / Proof Point |
 All Star Truck Parts |
Generic Imports |
OEM Replacement |
|---|---|---|---|
| Compliance Proof |
DOT/SAE/FMVSS Certified
|
Often Unverified
|
Certified
|
| Durability |
Heavy-Duty Waterproof & UV-Tested
|
Weak Adhesives / Fading LEDs
|
High Quality but Expensive
|
| Warranty |
30-Day Guarantee + U.S. Support
|
None / Overseas Seller
|
Limited 1-Year
|
| Shipping Speed |
Fast, Free U.S. Shipping
|
Slow (2–4 Weeks)
|
Variable / Dealer Only
|
| Customer Support |
Real Experts in Texas
|
Automated Chat Only
|
Dealer Service Line
|
frequently asked questions
HOW DOES THIS WIRING COMPARE TO OEM OR GENERIC CABLES?
This wiring uses thicker-gauge copper and tougher outer jackets than many generic cables, helping deliver more reliable power and better resistance to wear, vibration, and weather over time.
WILL THIS WIRING HOLD UP IN COLD WEATHER AND HARSH CONDITIONS?
Yes. The insulation is designed to remain flexible in cold temperatures and resist cracking, making it suitable for year-round use in heat, rain, snow, and road spray.
IS THIS WIRING COMPATIBLE WITH STANDARD 12V SYSTEMS?
Yes. This wiring is intended for standard 12V truck and trailer electrical systems. Always verify connector type and wire gauge requirements for your specific application.
DO YOU SELL CONNECTORS, GROMMETS, OR TOOLS I NEED TO COMPLETE INSTALLATION?
Yes. We carry a full selection of connectors, grommets, plugs, and installation accessories designed to work with our wiring. This makes it easy to get everything you need in one order and complete the install correctly the first time.
WHAT’S THE DIFFERENCE BETWEEN COPPER-CLAD ALUMINUM AND PURE COPPER WIRING?
Pure copper wiring provides better conductivity, lower resistance, and more consistent power over long runs. It also handles heat and load better over time. Copper-clad aluminum can be lighter and cheaper, but pure copper is preferred for durability, reliability, and long-term performance in truck and trailer applications.
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