I wondering as to what each wire is coming off the back of the bulb housing for the front turn signals? There is blue, brown, and black on the drivers side and light blue, brown, and black on the passenger side. I know black is ground but which of the other two is turn signal and which is running light? I want to hook my halos on my head lights up to it. I have a 1978 silver anniversary. 

Thank you, Chris.

Black is ground, brown is runnin/parking lights, blues are turn sigs. 👍

Awesome and thank you! Have a great day.

Probably a good idea to get yourself a copy of the Electrical Troubleshooting Manual, it has all sorts of interesting info in there, plus nice clear wiring diagrams.

I picked up my copy about 25 years ago from Ebay and there is still usually a choice of a few in various levels of condition.