Question about 2001 Hyundai XG300

1 Answer

Something that is drawing to cause battery to go dead

I replaced the battery and altenator , my mechanic thought it was the alarm module so he disconnected it, the battery still goes dead this time within a half an hour.

Your suggestion is appreciated

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  • dantfrs Jan 02, 2009

    He has checked for draws and he could not find anything.

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  • Hyundai Master
  • 6,674 Answers

Tell him to use his test light between + battery connection & battery post +, and start pulling fuses one by one. When you find the right fused circuit causing the drain, light will dim or go out. Don't forget, radio has a small constant draw for memory.

Posted on Jan 02, 2009

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Fixya guys give wrong info like Auto mechanics.Most of the time theirs nothing wrong with your car. Like if Battery dead. Just recharge it ! You don't need new battery like Stu*** fixya guys say!!


Sorry but batteries don't just go dead for no reason ! A parasitic draw on the electrical system ,do you know what that is ? Do you know what control modules are ? PCM/ECM , BCM , EBCM , SRS , HVAC etc .. After key is switched off these modules power down (go SLEEP) , sometimes they don't . This causes an electrical drain on the system causing a dead battery . I will admit some guys on here do jump the gun a bit . Never I repeat NEVER replace anything on a vehicle without testing . Load test the battery first .

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When you shut the car off something is staying on in the vehicle, causing a current draw on the battery, causing it to go dead over night. something that would cause this would be like a under the hood light, trunk light, interior light staying on. visually check it. and if you don't find anything you might want to buy a fluke/ volt meter, to check for unwanted current draw when the vehicle is off. your local mechanic could help. it could become more extensive then this but most likely not by the sounds of it.

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Battery going dead but altenator checks ok?


A VOLTAGE DRAW WILL NEED TO CHECKED. SOMETHING AS SMALL AS THE DOOR SENSORS COULD CAUSE THAT PROBLEM.GLOVE BOX NOT CLOSING,REALLY NOT A BIG PROBLEM TO FIND. HAVE SOMEONE SIT IN THE VECHILE ONCE YOU CLOSED THE DOOR AND LISTEN,DO A VISUAL INSPECTION YOURSELF BE SPENDING MONEY.

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Will not charge battery altenator is good


Check the ground cable at both ends for a good tight and clean connection. also check that the alternator is grounded. You don't say if the battery goes dead over night or how you think it is not charging but if it takes over night. You need to check for a draw on the battery. You can do this by making sure all doors etc. are closed and things are off. Then disconnect the negative cable from the battery and hook a test light between the battery and the cable end, if it lights you have a draw. Something is on and draining the battery. Then you have to find what is draining the battery. You can pull fuses one at a time to find the circuit and go from there to pinpoint the cause

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I would start with the altenator. The repair is very easy.

Rick after you replace the altenator and the system does not get any better. The system has a draw or short . The vehicle has a body control module . This could be the cause or the power distribution box in the engine were all the relays are is starting to go out. I would take the vehicle in to you local mechanic to check it out if the altenator replacement does not work.

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1 Answer

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seems to me you neglected to reinstall the ground cable body (to the eng.) possibly?
What did the 'new' engine come out of?
I hope you bought the alternators from auto zone or something and are getting them replaced under the lifetime warranty...

This is what I would do... remove the battery cable from the battery after you shut of everything in the car... lights blower fan et al... and see if you are getting an arc when you reattach it. That will give you a clue to whether a dead short is involved (if it arcs strong ) .
if you only get a spark it is normal , as there are draws that you can't dislocate w/o removing fuses.
If you dont get the dead short arc , then put a lead on the - NEG. post and ground the neg. to the engine dirrectly from the battery to any bolt on the engine bigger than 10mm. ( a bracket or the instilation hooks on the eng. should give you a reliable ground. if that causes an arc while the car is running my first thought is correct.
The lack of a good solid ground to the engine will cause the stalling out due to the numerous electrical componants that do thier job via variations in voltage. This voltage is measured in very small incriments,
and any deviation from set limits will cause your engine to run poorly.
It is my assumption that your battery starts the car , then the sole source of electric is being drawn from the altenater .
My ¢.02

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what it sounds like is that you may have a loose ground somewhere,most likely a ground strap from the engine block to the frame to the battery. chances are that because of the loose ground your altenator maybe charginging properly but the looose ground the current is not going to the battery so as you are driving the battery is being discharged. if this doesn't solve the problem then i suspect that your alarm is the problem. it is hardwired to the positve side of the of the system and is drawing your battery down. please rate the solution...thanks

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1 Answer

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Is the alternator charging properly.

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