Search  for anything...
KeyLine Chargers

Dual Battery Isolator Kit, 140Amp Battery Isolator 12v Kit, Battery Disconnect Switch 12V | Cars, RV, UTV, ATV, Marine Battery Switch by KeyLine Chargers

    • Based on 1,567 reviews
Condition: New
Checking for product changes
$114.87 Why this price?
Save $35.10 was $149.97

Buy Now, Pay Later

As low as $19.15 / mo
  • – 6-month term
  • – No impact on credit
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout. Payment plans are offered through our trusted finance partners Klarna, PayTomorrow, Affirm, Afterpay, Apple Pay, and PayPal. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Selected Option

Free shipping on this product

Eligible for Return, Refund or Replacement within 30 days of receipt

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

Availability: In Stock.
Fulfilled by Amazon
Arrives Wednesday, Feb 26
Order within 1 hour and 4 minutes
Available payment plans shown during checkout

Size: 140 AMP Kit


Features

  • DUAL BATTERY ISOLATOR 12V KIT Measuring only 2.6" x 2.6" x 2", it's the perfect dual batteries isolation kit for under the hood or Battery Relocation Kit. Say goodbye to power-robbing traditional battery isolator diodes, solenoids, or battery disconnect switch 12v with our Battery Isolator 12V that delivers optimal performance without sacrificing power.
  • DUAL BATTERY KIT by Keyline Charger is a Voltage Sensitive Relay that charges two battery systems. It ensures that the primary battery is always charged and ready to start the vehicle by cutting in at 13.3 volts and cutting out at 12.8 volts. It's like having two power sources with only one alternator.
  • RUGGED DURABILITY: The ideal choice for those who require a reliable marine battery isolator or a dual battery smart isolator for their car audio battery charger needs. The KeyLine Automatic 140 Amp Dual Battery Isolator is a durable product that can withstand extreme weather conditions and vibrations. Its IP65 certification guarantees its safety for off-road use, even in dusty and wet environments.
  • WHAT YOU GET: (1) 140 Amp Voltage Sensitive Relay (VSR); (1) 20 ft red battery cable; (1) 2ft black ground battery cable; (2) positive brass marine type battery terminals; (1) negative brass marine type battery terminal; tinned copper lugs & heat shrink; cable ties; easy-to-follow instructions. Easy-to-follow directions for the most novice DIYer. Power wire in, power wire out. What could be easier?
  • BUY WITH CONFIDENCE: Every 140 Amp Dual Battery Isolator is backed by an industry leading 12-month warranty. If you are not 100% satisfied with your purchase, simply take advantage of the No Questions Asked, 30-Day Money Back Guarantee!!

Brand: KeyLine Chargers


Product Dimensions: 2"D x 2.6"W x 2.6"H


Item Weight: 8 Ounces


Input Voltage: 12 Volts


Current Rating: 140 Amps


Manufacturer: ‎KeyLine Chargers


Brand: ‎KeyLine Chargers


Model: ‎Iso-Pro140DBK


Item Weight: ‎8 ounces


Product Dimensions: ‎2 x 2.6 x 2.6 inches


Item model number: ‎Iso-Pro140DBK


Is Discontinued By Manufacturer: ‎No


Exterior: ‎PVC Matte Black


Manufacturer Part Number: ‎Iso-Pro140DBK


Safety Rating: ‎Other


Voltage: ‎12 Volts


Date First Available: April 28, 2015


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Wednesday, Feb 26

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • Works great.
Size: 140 AMP Kit
Easy install
Reviewed in the United States on June 9, 2024 by clarence elam
    • Great isolator. Works great in 2016 Polaris Ranger 900-5 Crew.
Size: 140 AMP ATV/RV
Ive had this in my Polaris ranger 2016 900-5 crew, for about 8 months. I have 2, 1200 Odyssey batteries installed. This thing works like a champ. It passes the charge to the battery that needs it the most. I tax my system more than most people ever will, and this isolator does more than I need it to. You have to understand your setup and how it all charges or you wont understand how this thing works. I have 2, 54in curved 4D light bars, and 2, 50in curved 4D light bars, along with 2, 7in light bars, and in cab, mulit color lights. I can run all night on my setup. I can hunt 3,000+ acres, for over 8 hours without any issues. I can hear the isolator clicking back and forth, and I can watch my voltage move around. I never drop under 10 volts, on a full load, and that is after all night of hunting. It would of been nice to have longer and better neg and pos. cables, but because of all the other work done to the Ranger, I did have better cable laying around. Others will not have the same luck. So a tip to the seller. Just give the better, longer cables. It wont cost you that much more, and honestly even if it does, I would of paid to have the better cables. Outside of that, I didn't buy this for the cables. I needed the isolator, and it is great quality, and works flawlessly. ... show more
Reviewed in the United States on June 19, 2017 by Brantley Hickerson
    • Does the job at 1/3 the cost
Size: 140 AMP Isolator
Had a Redarc that failed just when I needed it most (in the middle of nowhere in a foreign country with no expedite delivery) This unit does same job, 1/3rd of cost so you can carry a spare and still save some money. Easy to install and functions as it supposed to so far.
Reviewed in the United States on December 24, 2023 by Calin
    • Don’t plan on using their red cable.
Size: 140 AMP Kit
Review Image by 55reasons 55reasons
If the power cable that came with the kit wasn’t so cheap I would give it 5 stars. I updated the batteries behind the seat of my 84 Toyota pickup rock crawler with this kit. It’s a good quality product until you get to the red cable they give you to hook up the batteries. It’s not nickel plated solid core, and it has very few strands. The insulation on the wire is more like hard plastic than a soft rubber. It’s a PITA to strip the insulation off the cable, and it just feels, like, really.....Chinese in origin. I’ve been doing things like this for over 30 years and this the first cable that was so unpleasant to work with that the whole time I just kept saying things like “Where did they get this wire?”, and “This is the worst wire I’ve ever seen!”..... Aside from that, everything else in the kit was good. I also think the mounting “kit” was cheap though. I didn’t use anything from the little duplicate bag. The heat shrink is cheap, (not extra thick) the screws are not stainless steel, etc. But if you ignore all the “accessories”, the unit itself is fantastic. ... show more
Reviewed in the United States on May 1, 2021 by 55reasons 55reasons
    • It works
Size: 300 AMP Kit
Installed it 4 months ago as a bank up battery for my system and aux lights. Works as it should and works flawlessly.
Reviewed in the United States on May 29, 2024 by Rojo
    • The best solution for battery isolation
Size: 140 AMP Isolator
I was looking for a good quality relay to be used in my Chevy truck to isolate an auxiliary battery. My OEM relay failed, but it was 30 years old. The auxiliary battery is used as one of two batteries for my pickup camper - one is in the engine compartment and the other in the camper. I tried three different isolation relays, two of which looked pretty good. The Stinger SGP32 was the best, since it drew the least amount of current when activated. But then further searching brought me to this relay, which works with a clever design using voltage rather than just an ignition circuit. I ordered one of these and the Jaycorp Smart Battery Isolator, which also looked good. When I received them from amazon I found them to be almost identical in design, and upon bench testing they both worked perfectly. I ended up keeping the Keyline product and returning the Jaycorp relay, but only because I liked the small red LED a bit better than the bright blue LED on the Jaycorp relay. Either relay looks to be a great solution for battery isolation. If this Keyline product proves reliable, I'll be a very happy camper! Update 8/3/21: This isolator has worked perfectly since I installed it. A 5 star product! ... show more
Reviewed in the United States on September 4, 2019 by Ray R. Kawal
    • Bad
Size: 140 AMP Isolator
I bought this for my promaster which i live out of, first, the sides don’t have holes for wires to come out, backplate doesn’t fit when wires are connected. Also it doesn’t work with my lithium batteries, either defective or just got getting high enough voltage to charge it. Final note is that the red light telling me it’s on would still be on after I’ve disconnected the starter battery, meaning it might be draining my house batteries. In the end I can’t return it due to having to cut a hole in the side to even test it, will be going with dc-dc charger from a more reliable company EDIT: THEY MADE IT RIGHT WITH A REFUND ... show more
Reviewed in the United States on October 16, 2023 by Elijah

Can't find a product?

Find it on Amazon first, then paste the link below.