No Sound From All Speakers

SYMPTOM
NO SOUND FROM ALL SPEAKERS

POSSIBLE CAUSES
- Amplifier ground CKT open
- Radio ground CKT open
- Fuse #30 defective
- Fuse #5 defective
- Fused B(+) CKT open
- Fused IGN RUN/ACCY short to GND
- Enable signal to amplifier shorted to ground
- Enable signal to amplifier open
- Fused B(+) short to ground
- Fused IGN RUN/ACCY CKT open
- Voltage at amplifier
- Output section of radio
- Defective amplifier (no output)