2002 E46 320d - Alternator Dead But No Warning Light

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  1. 2002 E46 320d - Alternator Dead But No Warning Light 
    #1
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    unclebigbad1's Car Details
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    As per the title, there is no warning light showing on the dash, however, the alternator is not charging and is showing approx. 10.5 - 11v via meter across the terminals and a little plugin LED device in the lighter socket.

    I only found out that the battery was low when i went to start the car and the starter was very weak and failed to start the car. Put the charger on for a shortwhile and car started fine but again turned it off and tried and again failed as very little power in battery.

    When i fully charge the battery - via terminals in engine bay- the battery will hold its charge for days and i can drive the car for a few miles but fails to charge.

    I am wondering if i have disturbed the single wire to the alternator connected to the back of the alternator - i think it has a small spade connector - with the many episodes of removing the manifold etc.

    Any idea what this wire is for - could it be for the charge failure light?

    Too dark to have a look now but will look later.
     
     

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    #2
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    E36Coupe328's Car Details
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    No point asking you need to go look tomorrow.


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    #3
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    I couldn't sleep so just went out with my torch and had a look and although the alternator is a bit buried, i could just about see the connector connected to the back of the alternator.
     
     

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    If all the wires are present and correct then it will most likely be your alternator has given up the ghost!
     
     

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    #5
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    Just checked, battery light on dashboard comes on when ignition switched on.
     
     

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    I had the same issue on my e61, alternator brushes was dying but no light. Alternator finally died completely, still no light!? If someone know it, I would like answer to this one too.
    cheers
     
     

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    I would put it down to the field wire, the smallest of the wires. Probably a duff connection or a break in the wire, possibly from moving it around too many times. Not sure about your model but the small wire should give out around 12v when not connected to the alternator; if this wire is faulty and can stop the alternator from charging as well, correct me if I am wrong?
     
     

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    Quote Originally Posted by mjojom View Post
    I had the same issue on my e61, alternator brushes was dying but no light. Alternator finally died completely, still no light!? If someone know it, I would like answer to this one too.
    cheers
    Easy, alternators have multiple sets of windings and diodes etc. Sometimes one goes and it still charges just doesn't keep up with demand, especially in winter for example where all of a sudden you are using more lights and heating.


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    #9
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    Quote Originally Posted by donny121 View Post
    I would put it down to the field wire, the smallest of the wires. Probably a duff connection or a break in the wire, possibly from moving it around too many times. Not sure about your model but the small wire should give out around 12v when not connected to the alternator; if this wire is faulty and can stop the alternator from charging as well, correct me if I am wrong?
    I will check the voltage to the wire, although as i have mentioned, the battery symbol does light up when i turn ignition on but goes out with engine started.
     
     

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