First post, wiring?

[Pressureangle]

2004 Yukon XL 2500, 8.1L, high options.
Just acquired it, bought it for Mom ten years ago. She quit driving, Sis-in-law drove it for the past 6 or so. She's fat and climbing in she tore off the driver's side A-pillar cover, no damage but there's a small harness with 4 wires; black, white, red, blue. Small gauge. They're torn free from something, I'd like to know from what; it has the overhead entertainment center, which of course I didn't test before posting but everything else works normally.
Anybody got this on top of their head?

 

[RST Dana]

I can’t help, but I’m digging that 8.1

 

[Pressureangle]

I can’t help, but I’m digging that 8.1

My new tow pig.

 

[Joseph Garcia]

Welcome to the Forum from NH.

Lots of knowledgeable folks here who freely share their knowledge, experiences, and perspectives. Knowledge is power.

I hope that you will become a participating member in the Forum's discussions.

Pics of the truck, please.

I cannot personally assist you with your issue, but other members of this Forum much more knowledgeable than me in this area will chime in. @OR VietVet

 

[Pressureangle]

 

[Pressureangle]

So while installing the harness for dash cam, found the other end of the harness near the mirror in the headliner. Repaired all the wires, but the rear seat entertainment center doesn't power up. I don't see a dedicated fuse, where to start looking?

 

[Pressureangle]

Ok so my inherent laziness wins again. INFO fuse was open, but separated near a leg like a vibration failure, hard to see.
All is well now.
Hatari!