I'm Trying to clean up the hacked wiring prior to installing my new head unit.
The question I have is the small gauge black wire that is connected to the antenna wire, is that a ground wire? Does it connect to the chassis of the head unit? Also where is the antenna booster located?

 

Not a ground, it should be the 12v feed from your head unit to the motor on the antenna. Use a digital voltmeter on a low Ohms setting and see if it is zero to ground, or a higher reading, which is probably the motor impedance.
I do not believe the 86.5 has an antenna booster, someone will chime in to confirm or otherwise.

 

Almost certain that is the antenna booster

 

86.5 had the antenna booster, located on the firewall on the passenger side. Small black box about 3*3 inches. Can be seen if you remove the glovebox. Connects to the windshield antenna.

Cheers!
Carl

 

Thanks Guys. So the what does the white wire hook up to? I thought it was the power feed for the booster.

 

The reason I'm asking is the wiring diagram int the WSM doesn't make note of the black wire. but it does show the white as being the feed from the head unit.

 

After doing another search on the antenna booster. I think you guys are correct on the black wire being for the power for the booster.
Now i need help figuring out what these wires went to. They are all in one bundle. Looking at the wire diagram I don't see any pairs like this for the radio. The red wires in the plug don't have power to them with the ignition on or off. The small gauge red wire is constant power.