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9-46
1977 PONTIAC SERVICE MANUAL
POWER ANTENNA
GENERAL DESCRIPTION
A new telescoping rod type power antenna unit is
available on all B Series. It consists of a 12V reversible
permanent magnet motor, drive gear unit and a mast and
support tube assembly (see Fig. 9-54). A plastic drive cable
attached to the mast extends or retracts the mast when the
motor operates the drive unit.
MAST
This system will operate only when the antenna dash
switch is actuated. The mast can be stopped in any position
during up or down travel by releasing the dash control switch.
Refer to Fig. 9-55 for the electrical wiring circuit.
The drive gear unit used on this system consists of a drive
gear and pulley assembly and a spool for storing the excess
nylon drive cable when the mast is in the retracted position.
When the motor circuit is completed by the dash switch,
the motor armature worm shaft rotates a gear and pulley. The
pulley then extends or retracts the nylon cable depending on
the direction of motor rotation.
The gear is coupled to the drive pulley by a torque
limiting clutch that permits continued gear rotation when the
mast reaches the limit of travel. To avoid damage to the
antenna assembly, the switch should be released as soon as
the antenna mast reaches the limit of travel.
Fig. 9-54 Power Antenna Assembly
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