What ground wire is this? (2004 Sr5 Xtracab)

Here is a photo of the rear underside of my 2004 Sr5 (4x4) Xtracab. There is a soldered ground wire behind the license plate that's been detached from whatever it was wired to. Is this wire OEM? I'm assuming it was grounded directly to the wiring harness that runs to the tail lights, but I wanted a second opinion.

 

Definitely not an OEM ground point, all original grounds under the rear of the truck would be grounded to the frame.

 

Not OEM.

Most likely for a trailer brake light harness that has been removed.

 

What if anything no longer works ??

 

I've recently installed a new stereo system (new speakers front and back) as well as a subwoofer. They all work perfectly after I wired them in, but for some reason the backup cam isn't working properly. The backup camera only works when my headlights are turned off, and I'm NOT pressing on the brake. Its a very odd issue but I'm open to any help or advice you may have.

 

Awesome thanks for your response amigo.

 

10-4, thanks.

 

How did you wire the backup camera for power?