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  #1  
Old 01-02-2006, 06:10 PM
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Charge voltage

Hello.

I have some problems with the chargesystem on 1990 230CE. I just replaced the alternator with regulator. I don't know if the problem was the same before the old alternator took of the heavens above, but I can only get it to charge at 13,5V, and if I turn on everything, heater, light etc. it drops to just above 12V Does anyone know if this is normal?
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  #2  
Old 01-02-2006, 06:54 PM
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I would check your battery connections and make sure they are clean and tight. If they are I would check your ground connection to the body to make sure that is clean and tight. With those accessories on the system should not load down that much...Was the alternator new or used....
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  #3  
Old 01-02-2006, 10:05 PM
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Quote:
Originally Posted by Jakob F Prasz
...I can only get it to charge at 13,5V, and if I turn on everything, heater, light etc. it drops to just above 12V Does anyone know if this is normal?
This might be expected at engine idle rpm.

What is your charging voltage at 2.000 rpm?
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  #4  
Old 01-03-2006, 01:42 AM
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It doesn't make much of a differance what rpm the engine is running at, meybe 0,2 v but thats it. I did check the connections to the battery abd to ground, but they seems ok. The alternator is brand new. I'm realy stuck here. I wonder if it could be the light control unit that is faulty?
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  #5  
Old 01-03-2006, 12:50 PM
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What shape is the main alternator lead in? Loose/dirty/bad connection there can lead to a voltage drop and potentially help kill an alternator.
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Old 01-03-2006, 05:01 PM
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They look ok, but I will check them again. Thank you :-)
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  #7  
Old 01-03-2006, 09:44 PM
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Check out this thread:

http://www.peachparts.com/shopforum/tech-help/108691-dead-battery-new-battery-new-alternator-still-dont-like-voltage-post754140.html#post754140

He had "bad" cables. Likely where the terminals are crimped on the ends of the cable. I have seen corrosion at these points before.

And also More battery/alternator troubles post #5. There is a good explanation of what voltages should look like.

Mike
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Last edited by mpolli; 01-03-2006 at 09:49 PM.
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  #8  
Old 01-04-2006, 09:59 AM
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Hey Mike, thank you
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