GMC 1976 ZEO 6083 Maintenance Manual page 629

12- 24 CHASSIS ELECTRICAL
NOTE : Do not disturb adjusting screw setting.
5 . Remove retaining ring and headlamp from
mounting ring .
6 . Position new sealed beam unit in mounting
ring and install retaining ring .
NOTE: The number molded into lens face must
be at the top of the bulb .
7 . Attach wiring harness connector to unit .
8 . Install headlamp assembly in panel opening,
turning slightly to engage mounting ring tabs with
adjusting screws .
9 . Install headlamp retaining ring spring and
check lamp aiming if adjusting screws have been
turned .
10 . Install headlight bezel with the (4) retaining
screws .
HEADLAMP DIAGNOSIS
For details on headlamp diagnosis, refer to Fig-
ure 35 . Additional diagnosis information is covered
later in this section under "Headlight Switch" .
COMPONENT REPLACEMENT
PARKING AND DIRECTIONAL
SIGNAL BULB (FRONT)
REPLACEMENT (FIGURE 34)
1 . Remove (2) lens retaining screws and remove
lens from housing .
2. Replace bulb and check operation. See Specifi-
cations at the end of this section for bulb No .
3. Install lens and retaining screws .
SIDE MARKER LAMP BULB
(FRONT AND REAR)
REPLACEMENT (FIGURES 34 and 36)
1 . Remove (2) marker lamp retaining screws and
remove lens .
2. Replace bulb and check operation . See Specifi-
cations at the end of this section for bulb No .
3 . Install lens and retaining screws .
TAIL, STOP, BACK-UP AND
DIRECTIONAL SIGNAL BULB
REPLACEMENT (FIGURE 36)
1 . Remove (4) lens retaining screws and remove
defective bulb .
2. Replace bulb and check operation. See Specifi-
cations at the end of this section for bulb No .
3 . Install lens and retaining screws .
NOTE : Check for proper positioning of lamp as-
sembly felt drain plug (See figure 36).
LICENSE PLATE BULB
REPLACEMENT (FIGURE 36)
1 . Remove (2) outermost screws in license lamp
lens .
2 . Replace bulb and check operation by turning
parking lamp on . See chart for bulb No .
3 . Install lens with the (2) retaining screws .
CLEARANCE AND IDENTIFICATION
BULB (FRONT AND REAR)
REPLACEMENT (FIGURE 37)
1 . Remove lens, retaining screw, and then remove
lens .
2. Replace bulb and check operation. See Specifi-
cations at end of this section for bulb No .
3. Install lens and retaining screw.
Figure 36-Tail, Stop, License and Rear Side Marker
Lamps