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8-64
1977 PONTIAC SERVICE MANUAL
fuses.
ELECTRICAL CHECK
The most common turn signal system problems are
generally electrical and may easily be fixed by the
replacement of fuses, lamps, or flashers.
First make these checks and replace any non-operative
components.
1. Check fuses. Replace if blown. If new fuse blows,
replace flasher in system. (There are two (2) flashers in the
signal switch system. The hazard warning flasher and turn
signal flasher are located on the fuse block on the G, AG and
B Series, while the turn signal flasher is up under the
instrument panel adjacent to the column on the A, F, X, H
and HM Series).
2. Check for secure connection at the chassis switch
connector. This is the turn signal on the column. Secure if
loose. Check all individual wire terminals for proper seating
in the connector bodies. Terminals should be locked in place.
3. Depress hazard warning button and check all lights
in signal switch system. Replace any which do not work. If
all lamps light when hazard warning is depressed, but
flashing does not occur, replace hazard warning flasher
located on fuse block.
4. If
all directional lamps on the indicated side light
when lane change or turn indicator is acutated, but no
flashing occurs, replace the turn signal flasher.
The above four steps will, in most cases, cure the
common signal switch system troubles. If the system is still
not operating correctly, determine whether the chassis wiring
or the signal switch itself is at fault.
To check the electrical function of the switch in the
vehicle, refer to the Steering Section.
HEADLIGHT
One Headlight lnoperative or lntermittent
CAUSE
CORRECTION
Loose connection.
Secure connections to sealed
beam including ground. (Black Wire).
Defective sealed beam.
Replace.
One or More Headlights are Dim
CAUSE
CORRECTION
Open ground connection at headlight.
Repair black wire connection
between sealed beam and body ground.
Black ground wire mislocated in headlight
Relocate as shown in Headlamp Circuit.
connector (sealed beam).
One or More Headlights-Short Life
CAUSE
CORRECTION
Voltage regulator defective.
Check and replace if necessary.
All Headlights Inoperative or lntermittent
Open wiring
-
light switch to battery.
Open wiring
-
light switch to battery.
CAUSE
CORRECTION
Loose connection.
Check and secure connections at
dimmer switch and light switch.
Defective dimmer switch.
Check voltage at dimmer switch with test bulb.
If bulb lights only at light blue wire terminal,
replace dimmer switch (does not apply
to G and AG Series, which uses ground side switching.
Check voltage at light blue
wire with test bulb. If bulb lights at light
switch light blue wire terminal, but not
at dimmer switch, repair open wire.
Check voltage at light switch red wire terminal
with test bulb. If bulb fails to light,
repair open red wire circuit to battery
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