GM Service Manual Online
For 1990-2009 cars only
Figure 1:

w/o Snowplow Package


Object Number: 703810  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
w/Snowplow Package
IGNITION, RUN, and START Bus Bar
B+ Bus Bar
G100 and G110
G100 and G110
Figure 2:

w/Snowplow Package


Object Number: 703815  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
w/o Snowplow Package
IGNITION, RUN, and START Bus Bar
B+ Bus Bar
G100 and G110
G100 and G110