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This day we used a SPARK as a guinea pig, but the concept can be applied to any motor vehicle. NOTE, this is for those who ask if the relay is really necessary for the cut: the relay is like a bridge, which supports a traffic in this case of 40A, while a common switch only supports 7A, so if we put it without a relay and with only one switch, generally all vehicles have an amperage passage of 30A through that cable, in conclusion, if you put the switch alone it will end up melting and causing many electrical problems, plus in this tutorial we do it this way to be able to connect an alarm module in the future: D (curious fact) there are few cars that do support only one switch, but you have to take into account this amperage, the switch always has to be greater than what is going to pass through it. You can see the diagram here https://drive.google.com/open?id=1wQV... If you have any questions, please leave them in the comment box ???? Due to message saturation issues, only users subscribed to the channel are being answered ????