There's nothing gray about it.

The point some are trying to make is that it does not matter WHAT your
opinion is as the plane owner or what the opinion is of the installing
wrench. It does not matter what is contained in the ACs and other pubs
if the mechanics don't all agree. The fact that some immediately call
the FSDO shows they don't have a common understanding of what others
find so crystal clear. Those who say this is clear may be technically
correct. But, as a practical matter, that won't mean a hill of beans
when someone who has a different view starts a beef about it.

At some future time, after the plane is sold twice, or some inspector
hungry for a violation performs a ramp check 5 states over, you could
well be flagged on the install. A wrench who does not "get it" may well
flag it on a pre-buy as an improper install. The wrench who signed it
off cannot (and likely will not) stand behind you.

Was the thing hard wired into the plane for power? Or did the shop
simply tie wrap the power cable to the harness and snake it around the
front of the panel to go into the cig. lighter?

Mike