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Ah well, that explains it. I'm looking at the diagram for an M809. I'm sure there are several differences.

@Fanjan Hmmm... on the wiring diagram, there are some wiring harness sockets/plugs with a "J" but the "J" wire always translates into a numbered wire further down the line. I cannot find an unused pigtail labeled "J." On an M816, I'm finding some unused "W" pigtails. What kind of truck do you...

@Bill Nutting Are you saying that you installed a separate switch or that you tapped into an existing switch? I'll fuse the converter for sure, but the only thing hanging off the converter will be a USB plug to charge my phone. If my phone isn't plugged in, it's not drawing any power.

In my M813, there is an unused female pigtail dangling from the dash wiring harness. The wire is #40, which according to the wiring diagram in the -20, is used for "panel lights." The sketch does seem to indicate a pigtail in the wiring harness at that point. This would seem to indicate that...