1992 E36 325 Coupe Charging/starting issues(FIXED)

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  1. 1992 E36 325 Coupe Charging/starting issues(FIXED) 
    #1
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    dj4man's Car Details
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    Hi,

    my coupe which ive owned for about 3weeks now has never had any problems starting or anything.

    Today, after the car was driven to my workplace, it was parked up unlocked for no more than 15mins. When i went to start it, it struggled! I stopped the engine and tried again and it wouldn't start....battery flat. Jumped it off and it started no problems.

    Checked the battery terminals and was getting 13.5v on tickover.

    Gave the car a good ride home, 80mph on motorway for 20mins.

    Arrive home, turn off and tried starting and it was slow but started. Tested the battery terminals again.....11.45v at tickover and 11.85v at 2k rpm.


    Is my alternator on its way out? There are no warning lights on the dash to indicate a charging fault.

    TIA>

    Dan
     
     

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    If you can check the charge rate out at the rear of the alternator, but it does sound like it has taken a dive
     
     

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    Yeah I'm with Ronnie on this one, doesn't sound too promising.
     
     

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    #4
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    Checked the output voltage and was getting 13.6v out of back of Alternator.

    got a new batt delivered at work but wrong size! fitted anyway and started car...on idle i was getting 13v at the battery...still a little low but much better than the 11.5v!!

    So think Alternator is best getting replaced?!?!?!

    Dan
     
     

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    Its hard to say, maybe see how it is for a few days? Whatever you choose, I'd recommend getting it checked out so you know if you need anything or not. You don't want to get stranded somewhere at a later date and be kicking yourself.
     
     

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    Check the charge rate again at idle, then with revs held up and then with lights and other consumables on. Does it stay around 13.8 volts?
     
     

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    If you are going to leave it a few days and see how it goes, I would take regular readings of the charge rate at the rear of the alternator as well as at the battery, as the readings you're getting are a bit random. This could be the result of the alternator breaking down, and probably is, but could also be down to a poor connection. If the charge rate is always steady at the alternator but varies at the battery then the wiring needs to be checked.
     
     

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    #8
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    Right..........NEW problem........i guess the alternator is little low in voltage output.

    With new battery on car i went to start it this morning and its FLAT! even with the old battery attached along with new one...still not enough power to start or even turn the engine.

    So,

    1, The alternator has failed??

    2, There is a mega drain on the system somewhere?

    Trying to get someone out to bump car off but with work commitments i'm not going to be able to get it checked thoroughly until next sat now.

    My aftermarket alarm stopped locking the driver door about a week before this happened, could the alarm be causing a drain? it has immobiliser incorporated into it. which still works fine.

    Dan
     
     

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    #9
    Dr of BMW gildersol's Avatar
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    Mega drain easy enough to test. Set multimeter to DC amps, disconnect battery negative cable. One multimeter lead on disconnected negative cable, the other lead on battery negative post. Reading on meter should be not much more than 50mA approx
     
     

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    #10
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    Quote Originally Posted by gildersol View Post
    Mega drain easy enough to test. Set multimeter to DC amps, disconnect battery negative cable. One multimeter lead on disconnected negative cable, the other lead on battery negative post. Reading on meter should be not much more than 50mA approx

    is this with engine running or off? Will try this when batt charged up.

    Cheers
     
     

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