Thread: Automatic Kill Switch

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I have a diagram for a two relay kill switch but am not real sure on one of the connects.
[IMG][/IMG]http://www.synthetic-oilonline.com/d.cgi/5025806/home.html

The diagram is for a coil ign system however mine is HEI and I'm not sure if the positive connect would be the same as the connect for the tach. This setup will disconnect when the ign key is turned off and the button must be pressed while cranking to start.

not sure but never interrupt the ground on an electronic ign. they have a habit of making their own ground. especially unilite's .

Some recent research I have done; I'll throw it is ya in hope it helps:
On HEI, the tach output is directly off the negative side of the coil, and the coil is switched to ground with an NPN transistor.

If your not sure you can disconect one of the wire at a time and see which one breaks the circut or the car won't start.
I do this with all my cars, then I look for the best place to hide the switch.
Everyone looks under the dash for a switch so try to think of some other place.
My favorite one was in a 69 buick I had, I has a plastic piece that was the size of a A/C vent that pop out.
It looked like it was solid but one day while puting in a stero I hit it from behind the dash and it came out.
That's where I put the switch, I had alot of friends in there looking for it and they could not find it.
Another good hiding place is under the ash tray.
Kurt