Re: How to: Ignition cutoff
Under the dash, between the steering column and the speedometer you will see a large red wire with a white strip that is connected to another large red wire with a white strip. That connector is where the ammeter type tachometer used in the 6 and 8 cylinder models connects up. That red wire is the ignition power line. Open up the connector and the ignition doesn't get any power.
Put a switch in place of the connector and you have your kill switch. Normal ignition current is suppose to be 2-2.4 amps, a switch should be able to handle that amount of current.