No Sound From All Speakers

SYMPTOM
* NO SOUND FROM ALL SPEAKERS

POSSIBLE CAUSES
- Radio 12V output circuit defective, open
- Radio ground circuit defective, open
- Power relay output circuit defective, open
- Radio 12V output circuit shorted to ground
- Radio choke defective
- Speaker power relay defective, open
- Speaker power relay defective, open
- Junction block defective, open circuit
- Defective radio
- Radio choke output circuit defective, open
- Radio output circuits defective