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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series / 4 Series > E30 (1982 - 1993)

E30 (1982 - 1993)
God's Chariot. The E30 was produced primarily from 1982 through 1991. The cabriolet was the one exception which was produced through 1993.

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  #1  
Old 03-30-2013, 12:25 PM
Brickenfist Brickenfist is offline
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Location: Rochester
 
Join Date: Mar 2013
Posts: 27
Mein Auto: 1985 325e
Battery being drained

New user looking for help.

I have a 1985 325e that is losing power. I jump the battery and it's okay for about an hour. Another hour later and it's almost dead, car won't start and the light are still on. Then later on it dies. There are times when the car just completely dies after I turn it off.

I was installing sub woofers into my car and automatically thought that was the problem. I unhooked the wires and jumped the car. It still died. I removed the interior light fuse and it lasted longer, but still died. I've checked the alternator and everything alright there. Now I do not know where else to check.
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  #2  
Old 03-30-2013, 05:06 PM
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First time First time is offline
INSANELY UNPREDICTABLE!
Location: in my house
 
Join Date: May 2010
Posts: 536
Mein Auto: 1984 318i
You obviouly have a small or maybe larger draw on the battery. While the car is running us a Multimeter to see how many volts the altenator is supplying the battery. I would test the post at the altenator and ground the negative probe elsewhere. There should be over 12v there with the car running. Additionally have somerev the car up to around 2,000 rpms and turn on the lights. Now you should be seeing anywhere from 13-14 (sometimes a little higher than 14 but should not be anything above 15v) which indicates a good altenator.

If these conditions are not met then replace the altenator.

If the altenator checks out then what I like to do is grab a 12v test light and disconnect the postive battery cable from the post and use the aligator clip on the test light to connect to the positive battery CABLE. With the ignition off Use the probe end and touch the positive post to complete the circuit. If the light on the tester lights up the. There is a draw on the battery.

Now here comes the slightly time consuming part. It helps to have a friend here. Pull each fuse out one by one. The light will go off when the correct fuse is pulled out. From there you can narrow the search down to that specific circuit. There might be a short somewhere causing the continuous power draw.

I will note that it could be multiple fuse that cause the problem. So if you come across a faulty circuit put it back in the fuse box and continue until you have pulled every fuse out. this will assure you that there isnt any other problem circuits. Hope this helps.
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  #3  
Old 03-31-2013, 10:31 PM
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BMWFatherFigure BMWFatherFigure is offline
Old School
Location: Perth, Western Australia
 
Join Date: Aug 2012
Posts: 2,171
Mein Auto: E23;E30;E38;E32;E34 +
+1 on above. Use a DVM if possible too.
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  #4  
Old 04-01-2013, 07:29 PM
Brickenfist Brickenfist is offline
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Location: Rochester
 
Join Date: Mar 2013
Posts: 27
Mein Auto: 1985 325e
It looks like the problem was fuse number 27. Don't know why, but everything is working fine now. If I continue to have problems, I'll try testing everything.
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  #5  
Old 04-03-2013, 06:54 AM
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Nick323 Nick323 is offline
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Location: Windhoek, Namibia, Africa
 
Join Date: Jun 2012
Posts: 704
Mein Auto: 323i E30 2-door
Thumbs down Godawful electrics

Welcome to the dark world of BMW electrics...
In my case I have now learnt to swear quite well in English (UK, OZ & American), German, Afrikaans & Portuguese
I am also convinced that the guys in München never forgave the rest of the world for not allowing them to continuing making a huge profit after 1945

Seriously, it is beyond me that an otherwise fine vehicle is straddled with such shoddy electrics
And the later models have shoddy electronics too
The easiest way to aproach these cars is to assume every contact, plug and hold down to be cleaned and retightened.
As to the guy who thought ot the circuit, he is either a genious or a sadist with VD
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  #6  
Old 04-05-2013, 09:31 PM
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BMWFatherFigure BMWFatherFigure is offline
Old School
Location: Perth, Western Australia
 
Join Date: Aug 2012
Posts: 2,171
Mein Auto: E23;E30;E38;E32;E34 +
+ there is enough spare copper in the average E30 to undermine the world market price!! Oh, and the circuit designer had an autistic mate with ADHD.
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Good - Fast - Cheap: Pick any two.
Current:
E23 735i; E32 735iL (X 2 - 1 Alpine White and 1 Glacier Blue); E34 535i; E38 735iL; R50 Cooper; R55 Cooper Clubman.
Previous:
E21 318i; E30 318i; E32 735iL; E34 535i; E38 730iL; E53 4.4i
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  #7  
Old 04-05-2013, 10:15 PM
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hornhospital hornhospital is offline
D'oh, You kids!
Location: In the Grumpy Chair
 
Join Date: Jan 2008
Posts: 13,842
Mein Auto: 1995 318is / 1993 325is
LOL, very true. And the lousiest plastic engine parts in the world.

Just be glad the electronics aren't Lucas.....
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1995 318is "Bebe"; 1993 325is "Elvira" 1985 635CSi "Katja" 1984 633CSi "Sylvia"
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  #8  
Old 04-06-2013, 12:27 AM
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_Ethrty-Andy_ _Ethrty-Andy_ is offline
E34 Converted E30 Fanatic
Location: Humble New Zealand
 
Join Date: Nov 2008
Posts: 6,138
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Mein Auto: E34 Touring AC Schnitzer
lol you guys haven't played with E34 and E32 of the same era. or later for that matter.

litereally thousands more wires than E30s.
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  #9  
Old 04-08-2013, 02:46 AM
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Nick323 Nick323 is offline
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Location: Windhoek, Namibia, Africa
 
Join Date: Jun 2012
Posts: 704
Mein Auto: 323i E30 2-door
Wink

Etherty, I know you have not only played, but also worked extensiely on the later Beemers
Which makes me ask, "do you also indulge in self-flagellation"
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