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Old 09-12-2019, 08:40 AM
doane2u doane2u is offline
doane2u
Location: California
 
Join Date: Jan 2019
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Mein Auto: 135i M Sport
Battery drain with top down

If I leave the top down the battery drains power and it won't start... takes about an hour or less. Any ideas what it might be? I don't have a schematic. No dome or other lights were left on.

Battery checked out good and the alternator is also good, putting out about 14v

Thanks,
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2012 135i M Sport Convertible (E88) 40k miles
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Old 09-12-2019, 09:02 AM
Markst Markst is offline
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One of the motors that fold the top?
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Old 09-12-2019, 09:26 AM
doane2u doane2u is offline
doane2u
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Does anyone have a link to the wiring diagram for this E88? I don't hear any motors running.
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Old 09-12-2019, 09:43 AM
Markst Markst is offline
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Automatic soft top operation.
Wiring Diagram


You should probably start at the fusebox though, check the voltage difference between the fuses' legs, so you know which one is using current.

Last edited by Markst; 09-12-2019 at 09:49 AM.
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Old 09-12-2019, 02:45 PM
doane2u doane2u is offline
doane2u
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Thank you, really appreciate it!
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