Gm 7 Round Trailer Wiring Diagram

Gm 7 Round Trailer Wiring Diagram. I looked all over TW and Google trying to find out which colored wires performed which function. What do I need to do to get the reverse lead to work on this wiring setup?

Hopkins Towing Solutions Multi-Tow Trailer Wiring ... (Addie Maldonado)

I tried looking up the wire diagram but can't find any thing that would help. Not sure which wires attach to what on your trailer connectors? Trailer wiring can be difficult to get your head around.

Learn all about trailer wiring testers at HowStuffWorks.

After reading here, I've seen that some people just splice into the body light wiring, while others suggest buying a kit from U-haul (or similar), and still others.

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What do I need to do to get the reverse lead to work on this wiring setup? Here is the plug info from etrailer, where you can also get an extension cord to keep from having to splice. A wiring diagram of the stereo system would be helpful also.