Top Post Knife Blade Master Switch 12V 24V Battery Disconnect Cut Off Shut Off for Auto Car RV-Marine Boat Truck Vehicle (Negative,Vertical)

I do wish it came with better instructions .Installed on my pickup truck . Works awesome. Easy to connect and disconnect everytime I use my truck.

Installed on my car and it works great. Easy to install

High quality great value

Car batteries have near doubled in cost within 5 years. And the worst thing you can do to a battery is let it drain down to dead. If you have a vehicle that sits a lot, I highly recommend to either disconnect the battery or to take the time to charge it occasionally. That brings me to this product. I've used it twice now, once on a top mount and then this one on a side post mount. Here's my takeaway. The mechanism can be disassembled to arrange either the lever or the battery post mount on either side. This mechanism is fairly big. If you have a top mount, make sure there is ample clearance when closing the hood. Id say a good 2 inches is needed from the top of the battery to the bottom of the hood for this to clear. This side post version doesn't protrude up or out as far as the top post mount version making it slight easier to install and for clearance. I had to free up some length on my negative battery terminals to reach the new location of where it screws to this. It only makes it a few inches further of a reach but it was enough to make my cable too short. Thankfully, the fix was only to only pop off one cable retainer about a foot below the battery terminal. That let me route the battery cable at a slightly different angle and freed up a few inches in length. Things that could be better; The plastic bracket that both the lever and the post mount to is fairly flimsy. It's not a solid piece of plastic as I feel it should be. It's hollowed on the back side. I wouldn't be surprised if it breaks over the course of several years. It definitely could be designed slightly smaller. The allen head bolt and locking nut that act as the hinge pin for the lever was very loose. The nut was a dozen turns away from being tight. This bolt / nut set the tension on the lever arm, tighten accordingly. Each side of this mechanism has a Phillips head bolt that secures the post mount and the lever arm to its plastic bracket ( the one I feel should be a solid piece ) The tread contact points for this connection is dismal. Its the equivalent of threading a machine screw into a thick piece of sheet metal. I would highly recommend adding thread locker to those bolts. All in all, this thing is cheap and it's construction reflects it. Nevertheless, it's cheap insurance and a great tool to help prolong the life of a recreational vehicles battery. Don't hesitate to work with it to make it a little better or fit better for your application. But be gentle to some degree. Others have mentioned they've broken it during install. I could see that but I'd still put that back on them for being too forceful. If you have a vehicle that doesn't get driven much and you have a little bit of mechanic knowhow, give it this a shot. But don't set expectations too high. It works, it does., but yes, it could be better.

Simple and uncomplicated - dependable and reliable.

Works great

Perfect for my car 🚗 that sits for a long time, so the battery 🔋 doesn't drain.

This master switch did its job for 4 years before the locking nut holding the knife blade portion finally gave out. I noticed my dashboard kept lighting up like a Christmas tree every time I hit a bump, so I went home and checked my battery voltage with a multimeter. The readings were as follows: 14.1V while running and 12.0V while the engine was turned off. After inspecting the battery closer, I disconnected the switch one last time and the knife portion of the master switch came off with it. I respect the okay build quality and this device served its purpose, but don’t expect this device to last more than 4 years. You get what you’re paying for. You will have to replace it eventually.