QUOTE(Phoenix 914-6GT @ Mar 17 2008, 07:49 PM)
So how does one use these? Does it matter what kind I get? I know I can get one at Action Auto for $20 but is that going to be fine? How did you mount it on your car?
It is basically a battery off/on switch. If this is for racing, check your sanctioning body to see if they have specific requirements on its location. It should be accessible and easily visible to rescue workers so they can shut the power off to the engine and primarily to the fuel pump. Make sure that the one you get is large enough in capacity to handle all the power that will be going through it. If it is only running the igintion, F.I. and fuel pump, then it won't need to be as big as if the starter also goes through it. Connect a lead from the battery to one of the posts, and everything that you want to shut off to the other post. Cover the posts with racers tape after you are done, to keep anything from bumping into it by accident. The red key on top is removable, so attach it to the car with a length of safety wire. If, on the other hand, you are using it for a security device, hide it somewhere convenient and route the ignition and fuel pump to it. Then take the key with you when you park it.