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Thread: What causes Battery overcharging?

  1. #1
    Guest Hugh Janus's Avatar
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    What causes Battery overcharging?

    Any ideas?

    The battery was fizzing and bubbling, also there appears to be some leakage and the sides of the battery have expanded

    I've removed it now but need to get bottom of issue.

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    On bikes its usually the rectifier/regulator. I don't know if the same applies to cars.

    If its getting too much charge, its probably the alternator.

    Have you checked the voltage across the battery when turned off and when idling ?

    Slap a multimeter on her and let us know....

  3. #3
    Guest arry's Avatar
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    Quote Originally Posted by Jonny Wilkinson View Post
    If its getting too much charge, its probably the alternator.
    Voltage regulator. On my 911 it could be changed out separately, if the alternator was still good. I changed the lot as I didn't trust a 16 year old part - as it happened both were fine and it was something else

    I think the S13 one is a 'sealed unit' in that the voltage reg sits within the body of the alternator - I've never changed one out on one, so I don't know for sure.

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    I think I've got a spare alternator in my shed for an S13 if they are the same.

    It was promised to Mr Pea but he hasn't collected or turned up to any event that I've been to in the last 12 months.

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    Guest arry's Avatar
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    13 and 14 are different JW. Same same (design) but different.

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    Ive got a spare 14a alternator in bits here that i took apart without realising how awkward it was to reassemble - in the end I gave up.

    Anyway, it was off an 87k 14a and was working fine when removed, so your welcome to have the pile of bits (it's all there) and either rob the regulator from it or try and reassemble it.

  7. #7
    Guest Hugh Janus's Avatar
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    Quote Originally Posted by james2404 View Post
    Ive got a spare 14a alternator in bits here that i took apart without realising how awkward it was to reassemble - in the end I gave up.

    Anyway, it was off an 87k 14a and was working fine when removed, so your welcome to have the pile of bits (it's all there) and either rob the regulator from it or try and reassemble it.
    i might do that if i can dude, see what i can make of it...ill PM you

  8. #8
    Guest Asht_200's Avatar
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    It could also be due to the battery being knackered


    Sent from my iPhone using Tapatalk

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    Guest Hugh Janus's Avatar
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    Quote Originally Posted by Asht_200 View Post
    It could also be due to the battery being knackered


    Sent from my iPhone using Tapatalk
    The battery is less than 8 months old.

  10. #10
    Guest arry's Avatar
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    Quote Originally Posted by Hugh Janus View Post
    The battery is less than 8 months old.
    And fit for the bin, now, unfortunately.

  11. #11
    Guest Hugh Janus's Avatar
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    Quote Originally Posted by arry View Post
    And fit for the bin, now, unfortunately.
    Yup unfortunately

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    Guest chrispy's Avatar
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    This happened to a friends Pug 106, the alternator was massively over charging the battery due to the voltage regulator failing and it fried the wiring as well as the battery.

    What a lot of people do with their track cars is fit a large fuse just off the positive side of the battery, so if the alternator regulator ever shits its pants and trys to fry the battery then the fuse goes, Saving your expensive lightweight battery.

  13. #13
    Guest Hugh Janus's Avatar
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    thank you dude, I've replaced the Alternator and all is well again, however good call on the inline fuse

  14. #14
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    these alternators are pretty easy to take apart and put back together again.
    there are a few guides on youtube.

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