UPDATE:Backup Lights NEVER off
Well, all of your support and posted diagrams are certainly appreciated!
The auxiliary relay box was actually easy to find. Unfortunately, when I pulled the reverse lamp relay, nothing at all happened. The backup lights remained lit! I thought maybe the diagram wasn't correct so I pulled the other relays one-by-one. Nothing...
I plan to crawl under there later this afternoon.
Thank you again for your help! It's so good to know that there are folks like yourselves so willing to pitch in and share.
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