Identify wiring & 3 prone connector, located under driver side dash

[beardogc20]

Can someone help identify what this connector could be used for?

I recently purchased a 1976 C20 scottsdale. The wire starts from the fuse box (15a) then continues to a online fuse and ends with a 3 prone connector. From connector a ground wire (not connected)

Thanks

 

[legopnuematic]

CB radio or similar power cable.

 

[beardogc20]

After your suggestion and a quick Google, it definitely does.
Thank you legopnuematic

 

[Radiohead]

Yup, Uniden CB power cord. Fits quite a few of the older models.

 

[beardogc20]

Thank you Radiohead

 

[bucket]

Yup, Uniden CB power cord. Fits quite a few of the older models.

What was the third terminal ever used for? I've only ever seen two wires in them, power and ground of course.

 

[Radiohead]

Not sure Bucket, I've only seen two wires as well. Maybe a polarity scheme?