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Why doesn’t my battery charge?

Discussion in 'Defender 90 / 110 / 130' started by payydg, Sep 25, 2021.

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  1. payydg

    payydg Well-Known Member

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    68EBD725-EB2E-4BF3-81DC-6069078B44B9.jpeg 5F6E13C4-AFE8-448B-97F8-99813E6A66A5.jpeg After having the engine and transmission out it’s all back together. Starts fine. Problem is alternator doesn’t charge at the battery.

    Theres charge coming out of the back of the alternator (about 15 volts) it’s just not getting to the battery. All the wires are connected.

    I’m going to get the multimeter out tomorrow but how does the charging system work? There’s no wire directly from the alternator to the battery? The thick brown wire from to the battery goes to a relay in the engine bay (photo two) and the a couple of wires go from the alternator to a plug (photo 1).

    Any thought. Have I ****ed something up?
     
  2. kermit_rr

    kermit_rr Green Member Full Member

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    There should be a big thick cable (finger thickness) going direct to the battery from the alternator. There should be another thick cable going to the fusebox from the battery.
    There should be an earth of the same thickness going from the chassis to the battery
     
  3. kermit_rr

    kermit_rr Green Member Full Member

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    Non of the wires in your pics are thick enough for alternator output
     
  4. payydg

    payydg Well-Known Member

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    Thanks mate. It seems the thick brown cable goes from the battery to the relay in picture two - you can just see the brown cable at the bottom of that picture.

    maybe the cable you describe has got hidden behind something and I didn’t notice
     
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  5. lynall

    lynall Well-Known Member Full Member

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    Most cars have the alt wire running direct to the positive terminal on the starter motor, then a fatter cable from that terminal back to the battery positive.
     
  6. Scooby22

    Scooby22 Well-Known Member

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    Not sure what model/engine you have but this is a 300 tdi diagram.
    Screenshot_20210925-212828_Drive.jpg m
     
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  7. payydg

    payydg Well-Known Member

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    Thanks, it a 200 tdi but maybe I missed a wire that connects to the starter
     
  8. payydg

    payydg Well-Known Member

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    You were all right I’d missed the cable from alternator to starter
     
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