Question about Hyundai Motor 2002 Sonata

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2002 Hyundai Sonata

I just had a battery and alternator (new, not rebuilt) replaced on my Sonata. Things have been great for about 6 weeks, until this morning. Both my battery light and my airbag light came on. Both lights have stayed on since. Could it be a lose wire or a bad sensor?

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Loose wire connections must be checked first.
Here is the simple way to check if the battery is discharged: Turn the ignition on, with the engine off, switch the windshield wipers on. If they move way too slowly, much slower than usual, the battery is probably discharged.
As the battery is relatively new, it can be recharged. All you need to do is to boost your car and let the engine run for a while to charge the battery

Posted on Jun 16, 2008

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If you drive your car to a spares shop/auto electrician they will be able to tell you within a minute if your alternator is the problem.

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    0e1822c.jpg
    Fig. Exploded view of the alternator-XG 300
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    2. 2.0L and 2.5L Sonata, Elantra and Tiburon: Pivot bolt to 14-18 ft. lbs. (19-25 Nm) and adjustment bolt to 105-132 inch lbs. (12-15 Nm).
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  5. Install the radiator mounting bolts, if removed.
  6. Connect the negative battery cable.

Hope helps (remember rated this).

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1 Answer

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If you haven't done it already, you need to disconnect the battery cable or the shorted diodes will drain it completely again and could even damage the plates from heat. 
Generally, rebuilt alternators are quite reliable so replacing with new isn't really justifiable; the commutators and windings are not stressed hard so replacing brushes and diodes and a good (chemical) bath are about all they need to do to restore them. You may even have a local shop that will restore your own unit if you wish.    

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