Wrong Lane wrote:
...I stand the lights inside the car on the shelf between the rear window and the back seat (you know, where you used to lay down to look out the back window when you were a kid)
A small piece of self adhesive velcro on the bottom of each light keeps them standing and in place. They are out of the weather, secure inside the vehicle and no danger of one falling off on a big bump.
X2 on this, this is what I do, using cheap, wired magnetic lights.
Lights never have to be removed, stay right where they are on that back shelf INSIDE the vehicle (where they can't scratch any paint). I didn't have to touch hardly ANY of the vehicle's taillight wiring, and entire thing can be taken out (and moved to a new vehicle one day) in a matter of minutes. And, costs less than $30.
Never have liked the idea of spending $70+ on a special kit to wire into taillights of a vehicle, only to have to spend that $$ all over again and do that installation all over again every time you trade vehicles.
As to where to run the wires: I ran the 'colorful' 4 wires underneath car along frame, then brought it up inside the trunk. From inside the trunk, wire comes out at top of back seats right where light is, so its barely visible. Works great.
Whatever you decide to go with, do not EVER run wires for magnetic lights across a painted surface (roof, hood, or sides)! Soon as you get up to speed, the wire vibrating, flapping in the wind will scratch your paint up but good. Route it under the hood, through the inside, whatever you have to do to keep it off painted surfaces. 'Twas one lesson I learned the hard, expensive way. After several detailing jobs including a 'wet sanding' procedure, the scratches on our toad are finally gone from that 'lesson'. :)