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RE BATTERY FOR E46 BMW 323i SE

BMW forum 3 series car: E21, E30, E36, E46, E90, E91, E92, E93, F30, F31, F34, F35

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RE BATTERY FOR E46 BMW 323i SE

Postby Rst250 » Mon, 28 Nov 2011 22:31:28 UTC

Hi all, I'm new here so just like to say hi!

I am having an issue with my 99 323i SE. The battery seems to be going flat within a few hours. I have done the "dash test" with the following results

Idle is at around 13
Driving with lights on etc is at 14ish

Got home left a few hours jumped back in and car just clicked.

Done the dash test again and the reading was around 10.3

It would seem the alternator is charging as when driving it fluctuates between 12 and 14, so I assume it's charging.

Has anyone got any ideas what this could be? I had the battery tested and they said its not faulty?
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Re: RE BATTERY FOR E46 BMW 323i SE

Postby Arunas B » Mon, 28 Nov 2011 22:40:57 UTC

Check if your heater blower motor goes off then you switc ignition of.
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Re: RE BATTERY FOR E46 BMW 323i SE

Postby Rst250 » Mon, 28 Nov 2011 22:42:47 UTC

Hi yes it does seem to. The car is silent after switching off, so I assume it's off?
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Re: RE BATTERY FOR E46 BMW 323i SE

Postby siraff » Mon, 28 Nov 2011 22:51:16 UTC

Check the boot light is going off when it's closed.
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Re: RE BATTERY FOR E46 BMW 323i SE

Postby Rst250 » Mon, 28 Nov 2011 22:52:31 UTC

I checked that tonight and it was going off. I opened the back seats to make sure.
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Re: RE BATTERY FOR E46 BMW 323i SE

Postby goldieandblackie » Mon, 28 Nov 2011 23:05:34 UTC

I repaced my battery last year on my 323ci with one from Europarts (Bosch S5) which comes with a 5 year warranty.Enter BATTERY15 for a 15% discount,there are cheaper bosch batteries as well.
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Re: RE BATTERY FOR E46 BMW 323i SE

Postby Rst250 » Mon, 28 Nov 2011 23:09:50 UTC

But I don't want to spend money on a new battery if it's just something that's draining it. Surely if I replaced a non faulty battery, it would just drain again?
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Re: RE BATTERY FOR E46 BMW 323i SE

Postby tenchiten » Mon, 28 Nov 2011 23:15:41 UTC

Arunas B wrote:Check if your heater blower motor goes off then you switc ignition of.


Yeah, I wondered if it may be a hedgehog related thing as well.
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Re: RE BATTERY FOR E46 BMW 323i SE

Postby Rst250 » Mon, 28 Nov 2011 23:27:13 UTC

Hedgehog related thing?
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Re: RE BATTERY FOR E46 BMW 323i SE

Postby tenchiten » Mon, 28 Nov 2011 23:37:13 UTC

A dodgy hedgehog may drain the battery.
Run a search for hedgehog or final stage resistor.
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Re: RE BATTERY FOR E46 BMW 323i SE

Postby Rst250 » Mon, 28 Nov 2011 23:56:26 UTC

Lol I see why it's called a hedgehog now... My blowers blow and turn off fine? Would this indicate that this part is fine?
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Re: RE BATTERY FOR E46 BMW 323i SE

Postby tenchiten » Tue, 29 Nov 2011 00:17:38 UTC

It's just a possible cause of battery drain to consider, amongst others.
Symptoms of a dodgy hedgehog seem to vary but some drain the battery overnight, others give the fan a mind of it's own and some just "pulse".
Mine was of the latter persuasion but never flattened the battery. I changed it before it could :wink:

Anyhow, just a thought.
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Re: RE BATTERY FOR E46 BMW 323i SE

Postby Rst250 » Tue, 29 Nov 2011 09:09:08 UTC

Hmmmm. Well, I am going to let my mate have a look at it tonight. It doesn't seem to drain right down, as central locking, etc all seem to work fine, so it would suggest to me that its possibly the battery, but hey, I am no mechanic, or electrician, so I think I had best leave it to the experts to diagnose the issue.
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Re: RE BATTERY FOR E46 BMW 323i SE

Postby Rst250 » Tue, 29 Nov 2011 13:53:41 UTC

OK, my friend run the battery diagnosis test and the Amps should have been somewhere around 680 and where down at only 111. The charging system is working fine, and the advice from the testing unit was to replace battery. So I will give that a go, and hopefully, I will have no more issues. Well fingers crossed anyway.
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Re: RE BATTERY FOR E46 BMW 323i SE

Postby goldieandblackie » Tue, 29 Nov 2011 18:55:21 UTC

Well i did say replace your battery :soap box:
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Re: RE BATTERY FOR E46 BMW 323i SE

Postby Rst250 » Tue, 29 Nov 2011 19:08:15 UTC

You did, and thank you for the advice. Most appreciated.
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Re: RE BATTERY FOR E46 BMW 323i SE

Postby gonz0 » Tue, 29 Nov 2011 20:23:13 UTC

people go through all this messing about, 1st proper answer at this time of year should be

"how olds the battery" ;)
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Re: RE BATTERY FOR E46 BMW 323i SE

Postby goldieandblackie » Wed, 30 Nov 2011 17:47:27 UTC

Well i manged 10.5 years out of my original battery,but i guess they dont make emm like they use too.
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