Radio

[Trouble]

 I assume one of these wires is a ground. Can someone tell me where I plug in the other wire?

[anlauto]

Coming from the back of the radio ? Those look like the speaker wires...both attach to the speaker. 

[Burdar]

Definitely radio/speaker related.  Where does the other end lead?

[Trouble]

 Both wires come from the back of the radio.

[anlauto]

We don't know a lot of your details here, but if this is what the back of your radio looks like, then the green/black wires both go to the speaker, and the red (power) and orange(light) plug into the main harness. The radio gets it's ground from a large mounting support strap.

[73_Cuda_4_Me]

It looks like a green wire with yellow tracer, and a multi-color (black, blue, yellow?)... looks more like seat belt warning wires?

Speaker would be a solid dark green wire and a black wire...

Any info on year and body type of car to help narrow down schematic to refer to?

[anlauto]

It looks like a green wire with yellow tracer, and a multi-color (black, blue, yellow?)... looks more like seat belt warning wires?

Speaker would be a solid dark green wire and a black wire...

Any info on year and body type of car to help narrow down schematic to refer to?

I thought that was just the "tear line" where the two wires where once joined and now are not ?

[73_Cuda_4_Me]

That is a possibility, Alan!