Noise Diagnosis - Four Ways Noise Can Enter A Radio SYS & the Typical Causes

Schematic:

FRONTWAY NOISE
^ Rood ungrounded or poorly grounded.
^ Antenna lead-in or antenna base poorly connected or corroded.
^ Defective secondary ignition system.
^ Poor grounding of relays, solenoids, switches, the receiver, or body parts.

SPEAKER WIRING OR HARNESS NOISE
^ Noisy wires routed too close to speaker wires.
^ Pinched, broken, or shorted audio wires. Defective connectors or speakers.

SIDEWAY NOISE
^ Ungrounded cables near radio, transmitting noise.
^ High current or noisy wires near radio, transmitting noise.

BACKWAY NOISE
^ Electrical components noisy or defective.
^ After-market devices improperly installed.
^ Vehicle wiring ground connection poor or corroded. Receiver poorly grounded.