[ALL STAR TRUCK PARTS] 12V 140 Amp Dual Battery Isolator - Voltage Sensitive Relay (VSR) (VSR Pro Kit)

Great product , now i have 2 Batteries , one to start my car & one just for my Sound System 👍

Seems to be working very well and is super easy to install. Doing a great job keeping both batteries charged.

This is my third time setting up a truck/camper with an isolator. The first two were with those bulky ones with diodes, voltage drops and a big ugly heat sink. This time I thought I'd try a starter solenoid. I bought a solenoid here on Amazon and there was a scary warning about it getting hot. Some customers had a problem with heat but others didn't so I thought I'd give one a try. WRONG! Within 5 minutes it was too hot to touch. Then I found this isolator for a similar price. Returned the solenoid, bought and installed this isolator. These isolators that function off battery voltage must be new since I never heard of them before. Another nice thing is you don't have to find a key-on ignition source to splice into ... typical with other isolators and solenoids. My only complaint is there were no installation instructions in the package. There is an extra skinny black wire coming out of the back of this unit and I had no idea what it is or what to do with it. Turns out it's just a ground wire that can be hooked up to any ground in the vehicle. Very happy with this isolator and for the price, I'm thrilled! :)

Easy to install working great.

Easy to install and works well.

Once fully charged this device will drain one of the two batteries until it hits the cutoff voltage which is at the limit of maybe starting the vehicle.Should increase the SHUTOFF voltage limit.

Installed the relay to replace my stinger isolator. Started up the car, measured the voltage and confirmed there was ~14.1-14.2 volts going into the relay from the starter battery, but 0 volts from the relay to the 2nd battery. Tried to isolate issue by checking if ground wire (the black wire that's preinstalled)/bad connections or cables were the issue but no problems there. It's looking like the item itself was defective, contacted customer support and may update if/when they respond.TL;DR=unit doesn't turn on although it's connected properly and has power going in via the battery and ground but no power going out.

Perfect product for the dual buttery set up in my 2019 turbo rzr.