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#1
12-19-2019, 12:49 AM
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2003 E500 battery drain overnight
I replaced my stock Audio 50 fiber optic head unit with a full screen nav unit since the CD and Cassette did not work. Then I realized that the CD player in it was shot and wouldn't even take a CD. I removed it and installed my original unit a couple days later the car died over night. I replaced the main and auxiliary battery and again the car died over night. Thinking there was something wrong with it, I removed it and reinstalled the full screen CD only unit and I no longer had the problem. I purchased another used Audio 50 unit and that works perfectly. That next day I get in the car and again it was completely dead. This seems so odd and frustrating!
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Current fleet- 1993 Mercedes 300SD 2004 Chevy Avalanche 4x4 2009 BMW 535i xDrive 1995 Saturn SL2 1993 Mercedes 300SE (parts car) Previous Benz's- 2001 Mercedes SL500 1983 Mercedes 300SD 1980 Mercedes 300TD 1996 Mercedes E300D 1999 E300DT 1984 300TD-T 1988 Mercedes 560SEL (parts car) 1979 300SD 2003 E500 2004 S430 4Matic 2001 E55 2003 E430 
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#2
12-19-2019, 06:02 PM
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I believe I have ruled out the head unit and the switch panel as the problem. I left them unplugged and there is still a complete battery drain over a 8 hour period.
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Current fleet- 1993 Mercedes 300SD 2004 Chevy Avalanche 4x4 2009 BMW 535i xDrive 1995 Saturn SL2 1993 Mercedes 300SE (parts car) Previous Benz's- 2001 Mercedes SL500 1983 Mercedes 300SD 1980 Mercedes 300TD 1996 Mercedes E300D 1999 E300DT 1984 300TD-T 1988 Mercedes 560SEL (parts car) 1979 300SD 2003 E500 2004 S430 4Matic 2001 E55 2003 E430
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#3
12-19-2019, 06:31 PM
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Start putting a meter on the fuse connections. There’s gonna be a huge draw or your battery is complete junk
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1993 e300 1995 e320 1994 e320 2006 s500 4matic 2004 Jeep wj overland 2001 Ducati 748 2004 Honda shadow aero
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#4
12-19-2019, 09:25 PM
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disconnect the seat module under the driver seat and retest the amp pull when the car has shut down and gone to sleep.
Those modules are known to go bad and cause battery drain.
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2012 BMW X5 (Beef + Granite suspension model) 1995 E300D - The original humming machine (consumed by Flood 2017) 2000 E320 - The evolution (consumed by flood 2017)
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