so the safest way is to follow these instructions "Drill a hold in a location under the dash through the firewall. Check BOTH sides of the firewall (cabin and engine bay) to make sure it is clear of wires, lines, and engine components. If its a double firewall like a lot of new cars, your gonna have a hell of a time. After the hole(s) are drilled through the firewall, your going to have to fit a rubber grommet in there (can buy from local automotive store) and put a hole in that for the wire to safely pass through. DO NOT SKIP THIS STEP OF THE GROMMET! I have seen cars literally burn to the ground because people decide tape or no grommet will suffice. After you do this, you will need to route the wire around the engine parts (keep away from moving parts) and fuse it no more than 12 inches from the battery. You will also probably need to buy and change the battery terminal to fit the wire onto it. Once this is done, you can route the wire in the car. DO NOT HOOK THE WIRE UP TO THE BATTERY WHILE ROUTING THROUGH THE CAR. Once you get it routed through the panels and under the seat, you can connect it. Have fun doing this __ amount of times for each light. If you wanted to, you could run a larger wire and tap the wires off of that once you got it into the cabin and under the dash but those connections are more weak points and possible danger points for each additional line to each light. Good luck! " ???