Cutoff Switch

Michael Colello · 02-20-2011, 05:41 AM

I have a 1999 Boxster. I would like to install a cutoff toggle switch. The instructions that I received with it is to splice into the ignition coil. It doesn't
say which one. All the spark plugs have one. I am a little leary about cutting a wire on a coil. Which coil do I connect this to? or is there another location (wire,
fuse, etc) that I can make the connection? Is the cutoff switch neccessary or am I paranoid?

JFP in PA · 02-20-2011, 06:33 AM

Adding a cut off switch to one coil will only shut off one cylinder, not what I think you are trying to do. You would be better off to locate the fuel pump power wire and put it there, that would prevent the car from starting...............

mikefocke · 02-20-2011, 10:23 AM

What are you trying to prevent? I've never seen a Boxster owner who felt it necessary to install such a switch and I see many much more expensive cars without them.

JMatta · 02-20-2011, 10:38 AM

As Mike stated, what are you trying to accomplish? Cut-off switches are used to cut the positive battery lead, typically in a track car application. Cutting power on a street car will cause numerous issues with the car's computer system and would not be recommended.

Wayne 962 · Wayne 962's Garage

If you want to cut off the fuel pump, then I would recommend tapping into and interrupting the flow to the fuel pump relay. Instructions can be gleaned from my article here: Pelican Technical Article: Boxster Fuel Pump Replacement - 986 / 987

-Wayne

JFP in PA · 02-20-2011, 11:07 AM

I think he is after a cheap anti theft device to prevent the car from starting........

Wayne 962 · Wayne 962's Garage

Quote:

Originally Posted by JFP in PA

I think he is after a cheap anti theft device to prevent the car from starting........

I think the cheapest way to accomplish this would be to simply pull the fuel pump relay. Doesn't prevent the car from being towed though...

-Wayne