This is VERY simple, you know the red wire coming off of the V1... it's currently hooked up to the + on your car battery or some other power source that's providing +12V? Cut the wire, wire one end to the middle of an SPST switch, the other end of this wire goes to the +12V on your battery/power source, now the other wire, that's just dangling there from your V1, hook that up to the other prong on the SPST switch. Now, when the switch is in 1 position both wires are touching each other through the switch.. when it's in the other, they are disconnected from each other, i.e. killing the power source -- killswitch

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