E34 520i Battery issues
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  1. #1
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    E34 520i Battery issues

    Hi guys, strange problem has developed with my E34.

    Battery up until now has been absolutely fine, no signs of slow turning over in the morning etc, and ive always been able to have my stereo on for a good hour or so and still start the car with no signs of battery issues.

    Came to the car Saturday morning and only the drivers door opened which seemed strange. Got in, turned the key and nothing. Dash lights were on but dim, and i could hear relays clicking over erratically. Got a mate out with a battery booster and it fired straight up but was running very lumpy for a few minutes like a couple of cylinders were missing. After a few minutes it settled down, so i turned the engine off and restarted it as a test. Fired up straight away. I put it down to accidentally leaving the stereo on overnight, and continued to use the car all day with no issues. Went out sunday night and again had the stereo on for a while without the engine running, no problems. Monday morning, again no problems getting the little'un to school and back, same in the evening when doing another taxi run.

    Didnt use the car yesterday, todat completely dead again. Didnt leave the front on the stereo so i know its not that. Tested the battery with a multimeter and its sitting at 8.2v. Also tested after the fuseable link with same results so i know its not that. Earth from battery to body is fine also. I have 2 amps in the boot but these dont fire up unless the stereo is running, and ive had my boot built out looking for loose wires etc.

    So could it be the battery even though its been fine between these two incidents? Im hoping to get someone to come and jump it today so i can nip out and have the battery tested, in the meantime anything else is should check?

    Thanks in advance!

    Gav

  2. #2
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    The battery is being damaged being at that low a voltage. How low did it get the first time it happened ?

    How old is the battery ?

  3. #3
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    Quote Originally Posted by Ferret View Post
    The battery is being damaged being at that low a voltage. How low did it get the first time it happened ?

    How old is the battery ?
    TBH i didnt check it as i was in a rush late for picking my daughter up, just seems strange that its gone from being fine to totally dead overnight, i would have thought it would show other signs like engine turning over slowly etc. Ive only had the car a year and a bit, so not entirely sure how old the battery is tbh, it doesnt look that old but being under the back seat its not really exposed.

  4. #4
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    Could be any number of reasons for it happening, but first get the car jumped, and battery charged then do a parasitic battery drain test: How to Find and Stop Car Battery Drains DIY Car Battery Drain - Popular Mechanics

    I'm not sure how E34's work, but if they work like E36 + E46's then it'll take 15mins for the car to "goto sleep". After 15mins or so, you'd want to see less than a 500mA draw.

    If that doesn't show anything, then it could be that your battery needs replacing.

  5. #5
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    Thanks mate, thats most helpfull.

  6. #6
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    Ok went to the local motorfactors and bought a new battery, they tested the old one and come up knackered. New one is somewhat smaller then the old one but was assured it would be fine. Fits it, and straight away im getting the hazard lights doing a strange flashing pattern, evenb without the ignition on. Had to pull the relay/fuse to get it to stop. Is the relay knackered or is it some kind of warning as its a definate pattern (flash-flash-miss-flash-flash-miss). Car runs fine though.

    Ideas? lol

  7. #7
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    Something to do with alarm, maybe?

    Thats maybe what damaged the old battery. Check for that parasitic battery drain.

  8. #8
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    Thanks mate. Its really strange, the only thing that stops it is cutting the power to that relay. Maybe the relay is knackered, but its never happened before. If i test it for drain its obviously going to come up as the relay wont stop clicking over. im stumped but gonna start with a new relay i guess.

  9. #9
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    The alarm hasnt been working since the batteries in the remotes died. Not been armed in about 8 months lol. Ive had the battery on and off loads of times over the last few months and its never done anything like it lol.

  10. #10
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    As you said, start with changing the relay. I'm sure theres another one close by thats the same you could use to test it.

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