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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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2022 Nissan Frontier Pro4x 1990 Mercedes 420SEL 1950 Packard 8 Previous German cars- 2001 Mercedes SL500 1983 Mercedes 300SD 2011 BMW 328i (manual) 2008 BMW 535xi (manual) 2006 BMW M3 (manual) 1980 Mercedes 300TD 2006 BMW 750i 1996 Mercedes E300D 1994 BMW 740i 2006 BMW 330xi (manual) 1999 E300DT Smoke silver/black 253k 2012 BMW 535i Xdrive M-Sport 1984 300TD-T 304k 1988 Mercedes 560SEL (parts car) 2010 BMW 550i xdrive 2017 Audi A4 Presitge 1979 300SD 313k 2003 E500 189k 
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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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2022 Nissan Frontier Pro4x 1990 Mercedes 420SEL 1950 Packard 8 Previous German cars- 2001 Mercedes SL500 1983 Mercedes 300SD 2011 BMW 328i (manual) 2008 BMW 535xi (manual) 2006 BMW M3 (manual) 1980 Mercedes 300TD 2006 BMW 750i 1996 Mercedes E300D 1994 BMW 740i 2006 BMW 330xi (manual) 1999 E300DT Smoke silver/black 253k 2012 BMW 535i Xdrive M-Sport 1984 300TD-T 304k 1988 Mercedes 560SEL (parts car) 2010 BMW 550i xdrive 2017 Audi A4 Presitge 1979 300SD 313k 2003 E500 189k
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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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