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Where theres smoke there's fire 200

posted by  chuck b on  Sat Sep 11 02:31 CST 2004
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last visit: Mon Mar 3 19:24 CST 2014
[RELATED]

My 89 wouldn't start, low battery. When I jumped it, wretched smoke from around the alternator appeared. Smell of burning plastic.

HELP!
--
1985 240 DL, 1989 245 DL








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    Further Info 200

    posted by  chuck b on  Sat Sep 11 09:16 CST 2004
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    last visit: Mon Mar 3 19:24 CST 2014
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    Voltage at the battery yesterday morning...11.5 volts

    This morning...3.5 volts
    This afternoon...2.5 volts.

    Short?
    --
    1985 240 DL, 1989 245 DL








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    Where theres smoke there's fire 200

    uid 18083's pic
    posted by  lucid on  Sat Sep 11 08:34 CST 2004
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    last visit: Fri Oct 24 12:31 CST 2014
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    I'm not sure, but if the cables were connected backwards, you may have cooked the alternator diodes.
    --
    Bruce Young
    '93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.








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      Where theres smoke there's fire 200

      posted by  chuck b on  Sat Sep 11 08:45 CST 2004
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      last visit: Mon Mar 3 19:24 CST 2014
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      I don't think that I did that, but...it was pretty early.

      If I cooked the diodes, do I put a new alternator?
      --
      1985 240 DL, 1989 245 DL








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        Where theres smoke there's fire 200

        uid 18083's pic
        posted by  lucid on  Sat Sep 11 10:11 CST 2004
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        last visit: Fri Oct 24 12:31 CST 2014
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        If I cooked the diodes, do I put a new alternator?

        I'm afraid so. And maybe a battery, based on your voltage readings above.

        To determine whether the battery is bad, or something external is dragging it down, you first need to get it charged up again. Then disconnect the ground cable and leave it overnight. If it's low in the morning, it's bad.

        If it holds the charge overnight, then you may have wiring problems as Don suggests below.
        --
        Bruce Young
        '93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.








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    Where theres smoke there's fire 200

    posted by  don hodgdon on  Sat Sep 11 02:37 CST 2004
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    last visit: Sat Mar 2 07:50 CST 2013
    [RELATED]

    Check the wiring harness that runs behind the lower pully under the front of the engine. Often the clamps will chafe the wires and they will short.
    --
    don hodgdon '89 744ti, '81 242t, '71 D-35







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