Power Amplifier

^ The optional amplifier boosts the sound of the 4 rear speakers in the Suburban when equipped with the premium sound system.
^ With the ignition switch in the ACC or RUN position and the radio control head ON, battery voltage is supplied to the power amplifier relay.
Voltage is supplied through CKT 143 (PNK/BLK) and CKT 40 (ORN).
The relay is grounded through CKT 150 (BLK) at IP ground 200.
^ When the relay contacts close, battery voltage is supplied to the power amplifier through CKT 140 (ORN).
The ground is completed through CKT 150 (BLK) at IP ground 200.