Originally Posted by JJGeneral1
how does that stop someone from wiring it to a switch that's grounded, that can be flipped on-off-on-off while driving to watch video?
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It doesnt LOL , like I said in what you quoted.... which is what I did for my head unit. I guess the reality of it is 75-90% of people that buy a head unit dont know jack electrical wise or dont realize that your e-brake lead is just a simple ground, and it's likely that its something manufacturers do as a minimum requirement by federal (or some other) standards.