No Sound From All Speakers

Tests 1 - 2:

Tests 3 - 7:

Tests 8 - 12:

Tests 13 - 16:

SYMPTOM
NO SOUND FROM ALL SPEAKERS

POSSIBLE CAUSES
- Intermittent short - fuse # 5
- Power amplifier - internal short
- Radio - fused B+ circuit shorted
- Fused B+ circuit shorted to ground
- Intermittent short - fuse # 30
- Radio - fused ignition switch circuit shorted
- Fused ignition switch output circuit shorted to ground
- Open fused B+ circuit to radio
- Open fused ignition switch output circuit to radio
- Open radio ground circuit
- Open fused B+ circuit to power amplifier
- Open ground circuit to power amplifier
- Open enable signal to amplifier circuit
- Enable signal to amplifier circuit shorted to ground
- Radio (no speaker output)
- Radio (no enable signal to amplifier)
- Power amplifier (no output)