Originally Posted by BigEd36
I just tied into the wire at the back of the truck for a 3rd brake light for a bed topper.
Every once in a while I manage to be just a little bit smarter than what I am working on. I located the brake light relay under the hood. I then determined which spade of the relay was power out. Then I took a 16ga. wire and stuck it in the spade socket in the junction block along with the power out spade. Added benefit of doing it this way, is that it keeps from putting any additional load on the brake light switch.
Hooked up to the fifth wheel camper yesterday and towed it about 20 miles to a buddy's place for storage. Everything worked pefectly.