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Interference noises, checking cable connections

NOTE: Procedure for interference noises which enter the system via the audio connections.
RADIO SYSTEM DIAGNOSIS FOR INTERFERENCE NOISES, CABLE CONNECTIONS

Work instruction Yes No
1
  1. As an experiment with the radio switched off, exchange the loudspeaker cables of the loudspeaker involved in the complaint with those of a fully functional loudspeaker at the amplifier output.
  2. Switch the radio on.
Is the loudspeaker involved in the complaint now free of interference noise?
  1. Check the plug contacts of the connecting cable on the amplifier and the loudspeaker.
  2. Repair or clean any defective connections.
Noise no longer present End
Noise still present Step 2		 As an experiment, use a new cable from the amplifier to the loudspeaker.
Noise disappeared: insert new audio cables and lay them separately from each other.
Noise no longer present End
Noise still present Step 4
2
  1. With the radio switched off, exchange the cables between the radio and the amplifier.
  2. Switch the radio on.
Is the loudspeaker involved in the complaint now OK?
  1. Check the plug contacts of the cable on the amplifier and the radio.
  2. Repair or clean any defective connections.
Noise disappeared End
Noise still present Step 3		 Install a functional amplifier End
3
  1. Check the audio wiring harness for a good ground connection.
  2. Measure with a ohmmeter at the negative terminal of the battery. Repair the wiring harness.
Noise still present?		 As an experiment, insert new leads between the radio and the amplifier.
Noise still present: install new amplifier and radio.
Noise remedied: install new audio cables End		 End
4
  1. Check the plug contacts of the connecting cable on the loudspeaker.
  2. Repair or clean any defective connections.
Noise still present?		 As an experiment, install first a functional amplifier and then a functional radio. End End
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