Easy-to-install 18 Circuit Painless harness features these pre-wired circuits: Coil, emergency flashers, horn, headlights, power windows, wipers, stop lights, gauges, radio (constant hot), air conditioning, heat, electric fan and turn signals, dome light, cigarette lighter, electric fuel pump, radio (ignition), power door locks, truck light/power antenna. All fuses, flashers and horn relay, pre-installed.
GM Harness for use with late GM columns with column-mounted ignition switch.
18 Circuit GM Column Wiring Instructions (PDF)