Pontiac Fiero 1988 Service Manual page 931

INTRODUCTION
Ground Distribution
Figure 8 is a sample Ground Distribution
schematic for the Headlights. It shows exactly
which components share each ground. This
information can often be a time-saver when
troubleshooting ground circuits.
For example, if both Headlights and the
Park/Turn Light on one side are all out, you
could suspect an open in their common ground
wire or the ground connection itself. On the
other hand, if one of the lights works, you
know that the ground and the wire up to the
splice are good. You have learned this just by
inspecting the schematic and knowing the
vehicle's symptoms. No actual work on the
lighting system was needed.
G R O U N D DISTRIBUTION (G101 AND G102)
FRONT LIGHTS GROUNDS
l h
F R O N T
p a r k / t u r n
L I G H T
l h
H I G H b e a m
H E A D L I G H T
LH
d u a l b e a m
h e a d l i g h t
r h
D U A L b e a m
h e a d l i g h t
RH
h i g h b e a m
h e a d l i g h t
( \
r h
F R O N T
p a r k / t u r n
L I G H T
V '
.8 BLK
150
.8 BLK 150
BLK/WHT I 151 .8 BLK/WHT 1 151 .8 BLK/WHT | 151
150
i
S105
.8 BLK/WHT 1 151
Figure 8 - Typical Ground Distribution Schematic