You can find a free wiring diagram for a 1982 Suzuki GS 550 in the owner's manual. You can sometimes even find them at auto part stores.
I am looking for a wiring diagram for the Intruder 1500 which also shows color codes. In the process I found the following link. It's for the Intruder 1500 and does not show color codes, but hope it's helpful. http://www.yankeecruisah.com/art/int-1500-wire.gif
http://www.suzukiinfo.com/sierra/ It has all the manuals and wiring diagrams
You could find in a book at autozone
A stereo wiring diagram for a 1982 Toyota 4WD can be found in the stereo's instruction manual. You can also find stereo diagrams by contacting the manufacturer.
What colors are the front signal light wires
Go to www.the12volt.com
You will find all diagrams for every part of the Suzuki DR 500 models on: http://www.cmsnl.com/suzuki-dr500-1984-se_model13207/partslist/
http://wiki.answers.com/Q/Where_can_you_find_the_wiring_diagram_for_a_1982_ford_e3501982 ford e350