Antenna: Description and Operation

When the Radio is turned ON, voltage from the PNK (143) wire is applied to the Antenna Relay coil. The relay contacts close, and battery voltage is supplied through the DK GRN wire to the Antenna Motor. The other motor terminal is grounded through the Antenna Motor's Up Switch, the GRY (161) wire, and the relay contacts. The motor drives the antenna up. When the antenna is at its full height, the Antenna Motor's UP switch opens and the motor stops.
When the Radio or Ignition Switch is turned OFF (and any door is opened with retained accessory power), the circuit to the Antenna Relay coil is de-energized. The Antenna Relay contacts open to the position shown on the schematic, applying battery voltage to the WHT (160) wire. The DK GRN (14) wire is now grounding the Antenna Motor through the Antenna Relay contracts. Since the Antenna Motor's DOWN switch is now making contact to the WHT (160) wire, the voltage to the motor has reversed polarity. It runs in the opposite direction and drives the antenna down.
At the end of the antenna's travel, the Antenna Motor's DOWN Switch opens and breaks the current flow. Both sets of switches (Antenna Motor and Antenna Relay) are now in the places shown in the schematic. The Radio is OFF and the antenna is down.
The antenna is connected to the Radio by coaxial cable.