I have a '97 2500 Dodge Cummins.  I pull a trailer for my business.  I've had the manufacturer replace the wiring once and my cousin (who has a mechanic shop) replaced it twice.  It's about to burn out my switch again now that I have to run my lights more.  It does not burn out the fuse.  I really could use this diagram but cannot download it.  Is there something I'm doing wrong?
Thanks
Never mind.  I just read the "welcome"
 letter more carefully.  Thanks for your patience and sorry for the confusion.