If you check the Triumph manual you will find a wireing code by color, its accurate to the extent I have used it. Speakers, courtesy lights, and am/fm radio. Black is always ground so use an ohm meter and alligator clip (batt . disconnected of course) to check continuity thru any wire you want to check. This shound not be applied to any extras they put on. like my battery charging system. Make your own diag. as you go along. Their imformation on most stuff I have Checked is minimal at best.