No Sound From One of the Loudspeakers

No Sound From One Of The Loudspeakers:

Fault symptoms
No sound.
SID displays audio information.

Probable cause of fault
Blown fuse for amplifier.

Check wiring harness.
Jiggle the wiring harness at several points and in different directions to reveal intermittent breaks and short-circuits in the leads.
Observe the multimeter, test lamp or diagnostic instrument during the test.