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E21 (1975 - 1983)

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  #1  
Old 06-26-2009, 06:01 PM
unicorn unicorn is offline
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Aternator trouble.

So I go camping, and run my car in the mountains of Tennessee, USA. Dragon Run, Route 129. A great run.
On the second day, the engine lost power, and engine eventually "dies". The alternator isn't charging the battery. So I get it towed to a garage, and the mechanic installs anew alternator and says it's charging at 13.8 amps. Cool, I drive off playing the radio, back to the campsite and I get 20 miles and engine lost power, and engine eventually "dies", again. Mechanic gets car back, installs another and the same thing happens. I towed it home and it sits in my garage. .

Now tell me. I have owned this car for 22 years, I replaced the alternator 2 times already... in 1989, and 1999.... Installing an alternator, it's plug and play. WTF
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  #2  
Old 06-27-2009, 04:42 PM
unicorn unicorn is offline
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I fixed the alternator. Just like I remember, a plug and play device , that's the alternator. I guess, the mechanic overlooked a broken ground cable that I found. Probably broke it off when he took off the alternator. A common oversight.... rather dark down there... need a light stick.
It's the fat ground cable from the the engine to the back of the alternator (neg side). It broke at the metal circle crimped at the wire's end. A common oversight.... The BMW is easy to work on. Why would I get rid of this car? I love It!
Anyway, I be riding tonight.

Last edited by unicorn; 06-27-2009 at 04:44 PM.
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  #3  
Old 07-03-2009, 01:42 AM
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jhowe1 jhowe1 is offline
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Mein Auto: E46 & E21
A couple days late for me.
But, the same thing happened to me on my e21.
Some chaffed wires and caused a lot of headache from that alternator. And were hard to see also.
BTW, your e21 looks amazing!
Mine is begging for some work... I cannot bring myself to just get rid of it though.
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  #4  
Old 07-25-2009, 04:51 PM
dictator dictator is offline
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Mein Auto: 1982 BMW 320iS
also get the battery tested. my alternator went out three times and it was partially because the battery was crap. mind you this was a fairly new battery (7 months or so) id also get that checked out.
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