bumping an old-ish thread.
helped a friend install a 15 dash in his sil80 today.
here's the Hazard/4way wiring + pics. used the 15 button w/ pigtail spliced to the stock 13 harness.
S13 wires--- to ---S15 wires
Green/Blue-----------Red
Black----------------Black
Lt Green/Black-------Blue/White
Green/Yellow---------Green/Black
Green/Black----------White/Blue
Red/Blue-------------Red/Blue
Green/White---------Green/White
Green/Red-----------Green/Red