2001 E46 330ci Red battery light.. then more came oon

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  1. 2001 E46 330ci Red battery light.. then more came oon 
    #1
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    Went out for a drive, battery light flickered on yellow, then red then stayed on, decided to get home on the way home, 5 mins later.. dsc, brake, abs lights came on.. wipers slowed.. airbag light came on.. thenbrakes light went red.. indicators all but gave up.. managed to limp it onto the drive..

    So I'm guessing the altanator has given up the ghost, what do you guys reckon? are they pretty easy to change?
    Last edited by him; 19-06-2011 at 23:17. Reason: Defo looks like Alternator
     
     

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    Check the battery connections and if possible get the battery condition checked as first job, if all ok it points towards the alternator, check it's still being driven and all connections are ok on it.
     
     

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    Thanks for that, alternator belt seems fine...

    Going to take the battery out and charge it.. is there anything special I need to do to do this?.. obviously make sure the doors are shut so windows go up!
     
     

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    Check the alternator by seeing if it goes up to 14.4v when increasing the revs. Could be the alternator or a loose ground strap.
     
     

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    wheres the ground strap, got a feeling its the alternator.. especially for it to just suddenly happen
     
     

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    oooh just found video about testing alternatoe output using the on board diagnostics.. very clever.

    so possible alternator, needs new rear diff bush and a leak in the coolant system somewhere.. great start to BMW life!. Guess at 80k miles to be expected!
     
     

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    Quote Originally Posted by him View Post
    oooh just found video about testing alternatoe output using the on board diagnostics.. very clever.

    so possible alternator, needs new rear diff bush and a leak in the coolant system somewhere.. great start to BMW life!. Guess at 80k miles to be expected!
    Most bmw's require a full overhaul of the cooling system when they reach 10 years old. Have a look to see if your rad is bowing at the bottom.
     
     

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    Quote Originally Posted by him View Post
    wheres the ground strap, got a feeling its the alternator.. especially for it to just suddenly happen
    I'd check all earthing points, remove and clean with sand paper
     
     

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    car has a new rad, but the expansion tank is still the original as far as i can see.. looks like I'll be ordering:

    Alternator
    water pump
    Expansion tank
    Thermostat and housing
    Coolant..

    anything else?
     
     

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    Defo looks like Alternator, charged battery for pretty much 24hrs on charger/conditioner, charged fully in around 4-5hrs, Put it in the car, did Battery test on dash, showed a healthy 12.6, started car dropped to 12.2 and Battery/Alternator light came on...

    Think i'll be ordering a new alternator!

    Talking of which, which alternator? Bosch, Valeo or other?
     
     

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