trailer hook up wiring

Some time ago I remember reading here about cautions re: correct factory wiring for trailer hook ups. As I recall there was a relay necessary to pevent burning up headlight switch. I have a '97 3500/cummins. I discovered the truck did not have the factory towing package. Having just replaced the headlight switch. I would like to not repeat the effort. Can someone refresh my memory with respect to trailer wiring. I would like to go with a 7 pin rv pigtail. I stopped at my local dealership for help. I was greeted with a blank look. Not the level of help I expected from a professional. Thanks in advance.

Reply to
Joe Fishback
Loading thread data ...

formatting link

Reply to
Nosey

MotorsForum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.