Electronics amateur here.
I bought a dash cam, front and rear. The rear cam currently feeds into the front cam, and records just fine. The front cam is powered by the cigarette lighter.
However, the manual tells me that if I give the rear cam power, it's supposed to show me fancy parking lines when I reverse. To do this, I'm apparently supposed to connect the back up cam's "red wire" (there's a dangling red wire on the rear cam that goes nowhere at the moment) to my car's reverse light. For various reasons, I can't do this. So I want to connect it to my car's cigarette lighter.
I bought a cigarette lighter splitter, so I have extra sockets there.
I bought a cigarette lighter "inverter" (max 15amps) which basically plugs into the cigarette lighter, then has a 10ft red wire (positive) and black wire (negative) which both end in a "lug" connection. I also bought a switch.
So, I figure I should just run the inverter's red wire through the switch, then connect it to the camera's red wire and voila? (right? wrong?)
But what do I do with the black wire? Is there a risk in just covering it up with electrical tape and letting it sit there eternally?