battery kill switch

Hi All, I have a issue I am trying to resolve. I am using a timed output relay (Redarc TIM05) as a kill switch. Once a momentary button is pushed, an output is set at 30 seconds, supplying 12v to pin 86 of a 30amp relay that runs inline with the starter motor trigger. The issue I am having, is...

Proximity kill switch for upgraded 20 volt Dewalt powered power wheels. Do you think it's possible I use the collar off my dogs invisible fence to send the kill signal to the toy truck. I'm pretty novice at this stuff I've always been into it but basically self taught just random basic things I...