I don't have access to my 23U right now so going from memory:
-Under the dinette seat (The side where the fuse panel is) there is a relay to lockout the awning. (There are two relays in there- 1 is inside a standard electrical junction box- this is for the TV outlet lockout. The other one is a standalone harness and is for the awning lockout.)
-Under the hood, towards the top (closest to the windshield) there are multiple in-line fuse holders; one of these is for the awning lockout.
YMMV... some stuff on my 23u definitely doesn't match the electrical diagrams.
v/r,
Mike
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