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E46 Convertible
The E46 vert forum. Talk about dropping your E46 top here.

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Old 08-28-2014, 06:13 PM   #1
flowerygirly
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E46 M3 convertible 2002 draining battery

I'm really hoping someone can help me. I have an E46 M3 convertible 2002 which keeps draining it's battery. We've replaced the battery twice in 2 months of owning her. I always open and close roof with engine running, turn off all electrical a (radio/ sat nav system) but if I don't use her for a week when I go to start her there's nothing happening, nothing at all - not even a slow turn over of the engine. Any ideas gratefully received. Thanks in advance!! :-)


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Old 08-28-2014, 06:16 PM   #2
Bish
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Could be a bad earth from the battery to the car body, failing that it could be your alternator not charging the battery


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Old 08-28-2014, 06:18 PM   #3
flowerygirly
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Thanks. We'll check both those things. Really sad that she's not starting every time because we won't have many more 'convertible friendly' days :-/


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Old 08-30-2014, 10:37 PM   #4
jamblazer
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My Ride: 2003 330Ci Convert
Hey...just bought a 2003 330ci with 62,000 miles and noticed it did not have a rechargeable battery flashlight in glove box. So I bought a used flashlight on eBay for about $20, plugged it in, and in about 3 days battery was dead. Took out flashlight, and car has sat for up to 2 weeks and still starts right up. Have no idea if this is your problem, but it might be worth a try to remove your flashlight. And if your battery runs down, you do not have to buy a new one. Get a trickle charger and leave it on overnight and it should be good.
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Old 09-02-2014, 01:21 PM   #5
johnrando
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Check the FSR, common parasitic drain on these cars.
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Old 09-02-2014, 01:22 PM   #6
flowerygirly
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Thanks, johnrando, sorry to be blonde but what's the fsr please?


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Old 09-02-2014, 01:24 PM   #7
flowerygirly
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Jamblazer - thank you for your idea. We have removed the torch and unplugged the original Motorola phone, that we only had in there for 'decotation'!! Will see if that helps :-)


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Old 09-02-2014, 01:26 PM   #8
johnrando
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No worries. I had no idea either but a long time ago I had a battery drain issue and took it to the dealer under warranty. It's a final stage resistor. No idea how to replace it because they did but once I researched it, found out it was a common problem. They just eventually go bad and they don't let the car "sleep". Therefore, the battery drains.
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DICE Ipod, Parrot/Connects2 Bluetooth, StealthOne Valentine Module, Hardwired V1
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