No Sound From All Speakers

Test 1 - 3:

Test 4 - 9:

Test 10 - 15:

Test 16 - 21:

Test 22 - 24:

SYMPTOM
NO SOUND FROM ALL SPEAKERS

POSSIBLE CAUSES
- Defective amplifier
- Voltage at amplifier
- Bad shorted fused ignition run/ACCY section of radio
- Fuse # 4 defective
- Fused IGN run/ACCY CKT open
- Fused B(+) CKT open
- Fuse # 18 defective
- Fused IGN run/ACCY short to GND
- Fused B(+) short to ground
- Output section of radio
- Defective amplifier (no output)
- Radio ground CKT open
- Amplifier ground CKT open