[shovelnose]

If I had to guess:

C=Air cond.

B=Thermostatic Bulb(Heat sensor)

M=Manual switches

G=Ground

+=Live power

I'm just guessing by the picture at this link I looked up.

http://www.fordmuscle.com/archives/2...an/index.shtml

Or Try Q/A at:

http://www.flex-a-lite.com/auto/175.htm

Hope this helps!