# Wiring driving lights on the roof...but where do i bring the wires into the car?

**URL:** <https://community.cartalk.com/t/wiring-driving-lights-on-the-roof-but-where-do-i-bring-the-wires-into-the-car/50948>\
**Category:** Maintenance/Repairs\
**Tags:** isuzu, trooper\
**Created:** [June 27, 2010, 3:19pm UTC](https://community.cartalk.com/t/wiring-driving-lights-on-the-roof-but-where-do-i-bring-the-wires-into-the-car/50948 "2010-06-27T15:19:43Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![719Frontier719](https://avatars.discourse-cdn.com/v4/letter/7/7c8e57/32.png) [@719Frontier719](https://community.cartalk.com/u/719Frontier719)\
**Post date:** [June 27, 2010, 3:19pm UTC](https://community.cartalk.com/t/wiring-driving-lights-on-the-roof-but-where-do-i-bring-the-wires-into-the-car/50948/1 "2010-06-27T15:19:43Z")

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I’m putting 3 lights on the roof rack on top of my truck and would like to wire the switch into the headliner between the driver’s and passenger’s seat, but how do I bring the wires into the car? or where? Do people drill holes in the roof when they install these or is there another way?

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**Author:** ![Cougar](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/cougar/32/21348_2.png) [@Cougar](https://community.cartalk.com/u/Cougar)\
**Post date:** [June 27, 2010, 5:22pm UTC](https://community.cartalk.com/t/wiring-driving-lights-on-the-roof-but-where-do-i-bring-the-wires-into-the-car/50948/2 "2010-06-27T17:22:56Z")

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You are going to have to drill a hole through the roof. If the roof rack supports are hollow I would run the wires through it and through the roof where it ties to it.

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**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\
**Post date:** [June 27, 2010, 7:01pm UTC](https://community.cartalk.com/t/wiring-driving-lights-on-the-roof-but-where-do-i-bring-the-wires-into-the-car/50948/3 "2010-06-27T19:01:16Z")

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You’re going to need more than just a switch to run these lights. You’re going to have to install a relay in the circuit to handle the current these lights are going to draw as a simple switch won’t handle the current.

So you could mount the relay under the hood, run the wire from the switch to the relay, and then from the relay to a 10 amp fuse, and then to the battery. Then run the wires from the lights down the tube, behind the cab, under the cab, to the relay. A wire from the relay to a 30 amp fuse and then to the battery.

Tester