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E46 M3 (2001-2006)

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  #1  
Old 06-06-2017, 02:53 PM
stftmin stftmin is offline
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Mein Auto: E-30's
Super high amp draw off battery

Hi everyone. I was doing the parasitic amp test on my 2006 m3 convertible using a 10 amp d/c current multimeter. I disconnected the negative cable from the battery attached a lead to the cable and one to the negative post. When I turn the meter on it runs up to about 15 amps and finally blows the fuse on the meter. All the videos show an amp draw of about 3 to 4 amps on first connection going down to milliamps after sleep mode. Anybody heard of this? maybe fuel pump kicking on or some circuit shorting out?
Thinking I should remove all the large fuses and see what happens. Thoughts would be appreciated.
Thanks again!
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  #2  
Old 06-07-2017, 05:23 AM
marcozandrini marcozandrini is offline
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Yikes! That's a lot of current. I'd check the auxiliary fan. This fan is either in front of the radiator (automatic tranny) or between the radiator and the engine (manual tranny). It has power at all times as its operation is controlled by the engine computer (DME). Its fuse is 50 amps so this dan draws a lot of power when on.
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Old 06-07-2017, 07:50 AM
stftmin stftmin is offline
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Location: Portland, Oregon
 
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Mein Auto: E-30's
Thanks for the thoughts. I started pulling fuses and found fuse 52, a 30 amp fuse, was creating the high draw. I suspect it has something to do with the headlight operation and may shut off after a short time. I pulled all the fuses both in the glove box and under the hood as well as all relays under the hood, also disconnected the positive wire terminated where you would jump the car under the hood. Still have a 80 milliamp draw. guess starter and alternator or next?
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Old 06-07-2017, 07:59 AM
marcozandrini marcozandrini is offline
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Hmmm, my fuse list for my 2001 330Ci shows that fuse for central locking. Does the M3 use a different fuse layout?
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  #5  
Old 06-07-2017, 08:14 AM
stftmin stftmin is offline
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Location: Portland, Oregon
 
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Yes, seems like there are a few things feeding off that circuit, the central locking is definitely one of them. Found an obscure post about circuit 52 controlling the hid module on the facelifted models. The battery lasts for a few days so I doubt this is my problem. It would drain the battery in a few hours with that type of load. Interesting problem
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