WirthCo 20138 Knife Switch for Top Post Battery

I just installed one of these on my 2008 Hyundai Sonata. It fits fine under the hood. The 20138 is rated for 250 amps continuous and 750 amps surge at 12 volts.

The only thing keeping me from giving it a full 5 stars is that the clamp was a bit tough to deal with. I could not get the clamp sufficiently far down on the negative terminal of my battery until I opened the clamp wider using two pairs of pliers.

Then, after tightening the clamp, I decided to reorient it. I found the clamp has no "springiness" to it, meaning after it was loosened, I had to open up the clamp a bit using a flat-head screwdriver before it would turn easily enough.

The clamp of the 20138 is made of brass (according to a WirthCo representative I asked). Brass is harder than lead, which is what the negative terminal of batteries is made of. So, expect the clamp to dig into your negative battery post somewhat.

No washer is supplied with the 20138 for use with the clamp bolt. This is not a big deal, but I supplied my own, as I prefer doing things that way.

Aside from that, it's great having this switch installed. Whenever I need to do electrical work on the car, disconnecting the battery couldn't be easier.

I saw this at my local RV repair shop for $ plus they wanted $25 bucks to install it. I found it here for about $24 and now it has been even lowered to $21. Easy 10 min. installation. and saves time disconnecting your battery when pulling a vehicle behind your RV.

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Just what we needed to keep our tractor battery from dying a slow, current-leaky death. Good transaction, speedy shipping, very satisfied!

Read Best Reviews of WirthCo 20138 Knife Switch for Top Post Battery Here

I searched all the auto parts stores around where I live in San Diego and all they had to offer in the way of an electrical current "on-off" switch was the type with a green plastic knob. Having had these before and inevitably enduring their failure, I was determined to buy a switch that has more to offer than the green plastic knob. I found it at (where else?) Amazon.com of course! This knife switch has a visual confirmation that the current is either "on" or "off". When the green plastic knob type fails there is no visual clue so you have to go through a sequence of disconnecting electrical connections and eliminating possible culprits. A real pain in the you-know-what. If you are in need of this type of switch, do yourself a big favor. Pay a little more and get a LOT more...performance. Four instead of five stars is because it could be made even stronger without much more cost. More than adequate as it is though.

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This poduct is easy to install and provides an easy way to protect a battery whenever a vehicle is parked for long periods