The Stovebolt Site Forums The Shop Area General Truck Talk LoJack, wheel locks, or armed security

You should be able to do this with one relay by modifying the circuit slightly. Just connect 87A to coil (-), 30 to ground, 85 to 12 volt hot with ignition on, and jumper 86 to 87. Use the momentary pushbutton to connect between the 86/87 jumper and ground. With the ignition switch on, press and release the pushbutton will actuate the relay which opens the circuit between coil(-) and ground and at the same time connects the relay coil to ground. The relay will stay actuated until the ignition switch is turned off.