Batter drain with humming noise under dash
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Audiworld Junior Member
Joined: Jul 2009
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Batter drain with humming noise under dash
1992 100CS.My battery is draining and it load tests out OK.When charging the battery and everything turned off in the car I am getting an on/off humming sound from the underside of the dash far left side.Each time it hums the batt charger shows additional charge so I know this is what is draining batt.I pulled all fuses out one at a time and humming did not stop I pounded on the spot under the dash and the humming quit.Battery stayed up OK.Any ideas as to what the is running causing the humming and batt drain?Thanks,Ron
AudiWorld Member
Joined: Nov 2008
Posts: 284
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1992 100CS.My battery is draining and it load tests out OK.When charging the battery and everything turned off in the car I am getting an on/off humming sound from the underside of the dash far left side.Each time it hums the batt charger shows additional charge so I know this is what is draining batt.I pulled all fuses out one at a time and humming did not stop I pounded on the spot under the dash and the humming quit.Battery stayed up OK.Any ideas as to what the is running causing the humming and batt drain?Thanks,Ron
Alternately you could try taking each relay out one by one in the box under the hood right above the driver's side footwell.
If that doesn't work, I'd try asking on quattroworld.com, there seems to be a lot more knowledgeable people there.
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