Top Post Battery Master Disconnect Switch

As I worked on an old car, I kept removing and reconnecting the negative battery cable. I bought this switch to allow me to quickly and easily disconnect without having to use tools again and again. The price seemed right and I figured that it was a straightforward design, so quality couldn't matter too much. However, I was disappointed when I tried to install the switch. The post on the switch designed to mount the battery cable is smaller in diameter than a standard battery post. As such, I cannot tighten the battery cable onto it. The switch's post has a hole in it so one COULD mount a battery cable with flat ends (eye terminals), but there is no way for me to use this as designed with the existing standard battery cable. MAYBE newer battery cables have more adjustability and might work with this, but it is not like my car has an odd sized cable, it is just old. I haven't yet decided how to address this issue, but at a minimum, the switch is not usable out of the box by me for my car.

I have tried two of these. The one marketed by Gama, and the Morosso. Actually they were identical. Pathetic, and made in the U.S. Even has a little American flag in the thumbwheel. The first one lasted 6 months. The second, 10 days. On both of them, the male lug was too small of diameter for negative battery clamp to securely clamp. With the second one, the Morosso, I went out and bought a different ground cable with a clamp that was small enough to securely clamp. I figured I had the problem solved. WRONG!! Twenty minutes of running on my diesel tractor, I noticed the glow plug light on. I opened the hood, and sure enough, the switch had broken in the identical spot the first one did. I would not recommend or buy another one of this design. It looks pretty stout, but looks can be deceiving.

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Bought this for my 2002 Audi TT cute car, but it sucks the life out of batteries in a matter of days if it's not driven. I use a battery tender at home, but when I leave the car elsewhere for more than a night I'm resigned to needing a jump. AAA has always been pleasant about it, but that's not my idea of fun, as much as I travel. So Master Disconnect Switch to the rescue! The instructions were clear and precise, it took all of 3 minutes to install.

It fit perfectly on my top mount battery, I had none of the issues mentioned in other reviews. Just a twist cuts the power completely.

Couldn't be more pleased!!

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I have an oldder Towncar. Instead of spending hundreds of dollars at the Lincoln Dealer to trace out a slow battery leak that takes 30 days to drain the battery down, I inserted this battery disconnect for under 8 dollars. It works perfectly. I did have to adapt my terminal wire connector slightly, but the product seems well made, works perfectly, and solved my problem. tmcBattery-Disconnect Switch Will Fit Both Side Post and Top Post

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This is a great little gadget for solving my voltage leak / battery drain problem on my Polaris UTV. Its cheap and very effective... zero room for improvement