Question about Hyundai Elantra

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Hyundai alternator has no output is there a fuse?

My daughter in laws car had a dead battery, I replaced the battery and had the alternator checked at a parts house. They said the alternator was okay but the printout they gave showed zero volts from the alternator and the car stalls if I disconnect the battery. I wonder if there is a fuse or fusible link since the car is only 5 years old it seems unlikely the alternator would fail. A rebuilt alternator is 170 dollars and I'd hate to replace it and have the same problem.

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  • Anonymous Mar 14, 2014

    2002 Crown Victoria .. Alternator failed .. replaced it and checked the battery .. testing shows 14.4 volts running. The volt meter in car is showing proper voltage but the battery icon is still lit up and won't go off. disconnected and reconnected the battery .. it still stays lit. Will it ever go off?

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Is the regulator built into the Alternator on this vehicle??

If the regulator is messed up - it can keep the alternator from producing output.  I am not familiar with this particular vehicle.

Airframe and PowerPlant mechanic.  I am familiar with principles, and how stuff works...  Clarify with the 'parts house' what they mean by the alternator being OK - while producing 0 output.  A lot of vehicles now have the regulator built into the Alternator...

A Hanes or Chilton's book would probably be able to help, and since the car is only 5 years old - see if you can pick up a Factory Repair Manual, and diagnosis troubleshooting flow chart.  These items are worth gold in fixing specific vehicles.

You could also subscribe to: alldatadiy.com    This is another technical resource base.  Hope this helps.

And: Yes, there are fuses.  A fusible link would probably mean the car wouldn't run, and/or a direct bad short.  A fuse could have inadvertently blown - look around.  Get a book.  Electrical stuff needs a roadmap.

Posted on Apr 19, 2009

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Posted on Jan 02, 2017

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Replaced alternator but battery light stays on the dash


This light on dash is telling you, alternator is not charging or current is not reaching battery. With a voltmeter check your alternator output at battery. It should be at least 13.5 volts. If less than that check output at back of alternator, big red wire bolted to alternator. If voltage is within specs. then you may either have a blown fuse, open(broken) big red wire from alternator to baterry. Check big red wire circuit integrity by proving back of alternator where wire bolts to alternator. With the engine not running, there should be battery voltage at that bolt/wire. If no voltage repair open in circuit, either a fuse or broken wire( usually). If still no output(13.5 volts) or more, check power ground to alternator plug. If these power ground check out ok, then you more than likely have a defective alternator.

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Could have damaged regulator. When the car is running have you checked the voltage at battery terminals. If battery is charging it should be around 14 volts. If around 12 your charging system is fubar.

Meanwhile if you have to charge the car every day then something in the car is draining the battery, Using an ammeter you need to track it down, Hook it up to battery and pull fuse out one at a time till the drain goes down. That isolates the circuit with the problem.

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Use a 21W indicator/brake lamp with wires on it. Disconnect the battery and remove the fuses, connect one wire to the battery and the other from the lamp to each fuse in order to find out where the drain is going. The most likely is the diode pack in the alternator leaking.

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You don't say what year your truck is but since the 70's the alternator and voltage regulator are housed together. Use a voltmeter to check the output from the alternator to a good battery when running it should be putting out 13-14 volts if not there is your problem.

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Hi,
Info should be in Owner's Manual or need to go to dealer.
Here's what it looks like:
PIC


Also, a bad alternator can drain the battery - yes, even w/the car off.
GL,
Td

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The battery ran out of power because the alternator is not charging it.
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it sounds like you have blown fuse to the Alternator.. I don't know what car you are talking about but they charging systems vary.. But if alternator isn't getting all the power it needs it won't charge. this should be checked.

good luck

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