Pontiac FIREBIRD 1972 Service Manual page 807

ENGINE ELECTRICAL 6E-45
IONNECT TACHOMETER
:ROM THIS TERMINAL
'0
GROUND.
SOME TACHOMETERS
i
-
.
$ a
M U S T CONNECT FROM
'HIS TERMINAL TO
iNERGlZER POSITIVE
(+I.
IONSULT TACHOMETER
>
.
Fig. 6 E - 6 0 Unit Distributor
-
Typical
The magnetic pickup assembly is mounted over the main
bearing on the distributor housing, and is made to rotate
by the vacuum control unit, thus providing vacuum ad-
vance. The timer core is made to rotate about the shaft by
conventional advance weights, thus providing centrifgual
advance.
I M PORT ANT:
When making compression
checks, disconnect ignition switch connector
from Unit Ignition System.
No periodic lubrication is required. Engine oil lubricates
the lower bushing, and an oil-filled reservoir provides lu-
brication for the upper bushing.
IG.NITION AND STARTING SWITCH
The switch is located in the steering column on the right
hand side just below the steering wheel. The electrical
switching portion of the assembly is separate from the key
and lock cylinder. However, both are synchronized and
work in conjunction with each other through the action of
the actuator rod assembly.
For a complete explanation of the key and lock cylinder,
and the actuator rod assembly, see STEERING, Section
9.
The ignition and starting switch is key operated through
the actuator rod assembly to close the ignition primary
circuit and to energize the starting motor solenoid for
BOLTS
TIMER CORE
Fig. 6E-61 Unit Distributor
-
Exploded View
The ignition switch used on all cars has five positions: Two
"OFF" positions; (one being the familiar "OFF" position
found on previous model switches, and a new position
known as the "OFF-LOCKED" position), "ACCES-
SORY", "RUN" and "START" "OFF" is the center po-
UNIT
IGNITION
cranking.
Fig. 6E-62 Unit Distributor
-
Basic Wiring Diagram