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Hyundai Tucson battery and alternator

I had read many posts on the Tucson Battery and Alternator problems on the internet and think they deserve a thread dedicated to the two parts. We wish to identify which one of the two or both have fault for the hard or failed start in order to replace the right one instead of waste money on the scapegoated part. A bad battery can fail you and even a good working alternator can't charge it; And a bad alternator is unable to charge even an excellent battery and the battery would be depleted after some period of running or idling the car.

Here is my case (I had posted in the engine thread and just move dit to here):
I have 2005 Tucson and had only a little more than 10000 miles. Last month I had a little problem in satarting the car. It took more than 5 seconds to start but never failed to start and the warning lights on the display are dark during start. That was after about of week of idle and nobody drove it. To me it appeared to be battery leaking but I am not sure about that. Today the dealer said the battery needs to be replaced and since the warranty is only good for 2 years and it has to be proprated for the replacement. I chose to replace it myself. I don't think the batter should be bad this soon. If more people have battery problem that's a sign that their battery is not of good quality. Even you have stereo installed that should not exhaust the battery, let along twice a day. If the problem is only the battery that's OK and we can install a better one to last long.


  • greatcarsgreatcars Posts: 66
    I went to a sears store to check replacement battery for the 2.7L tucson and the book shows Die Hard one with 124R as group size and 600 for CCA but the store does not carry that one.

    The menual does not give out procedure in replacing the battery. I had replaced batteries for my old cars with alarm and I had no problem doing that. I am not sure if the procedure will be as simple as I did on my old cars. Mine is still running but sooner or later I have to replace it.
  • greatcarsgreatcars Posts: 66
    OK, I checked out Sears, Target, Kmart, Costco, Pepsboy and Walmart. The battery for 05 Tucson 2.7L engine is group size 124R and has 600 CCA (according to the book of Diehard and EverStart and Kirkland) but none of the store carries it.

    On the original battery there is no specs or something. I did measure the physical size of the original battery and it has 8"Hx6 3/4"Wx10"L. In Walmart I found these battery MAXX-24S and MAXX-24FS (Gold, their highest rating, list price $73.88) have exactly same physical dimension and have CA 875 and CCA 700 and 12V specs and has 3 year free replacement and 9 year prorated wanrranty. I just want to make sure it CAN be used on the Tucson though it's NOT listed for Tucson on the EverStart book. I guess the Group Size is more than physical dimension but I don't know more than that. I had used a value (the lowest rating of them) EverStart battery on my old car for more than 5 years and it was excellent till the point I got rid of the old car. So for the Gold class battery it should be even better. It sucks Hyundai only gave 2 year warranty on battery. The prorated rate after 2 years still cost 70 bucks and who know what they will install. Any respons? Thanks. btw, I still can start the car as long as I don't leave it idle for a few days so I am not in rush to replace the battery. But the dealers said the battery is no good and needs replacement in last week visit. I can't rule out if the radio is draining the battert as some other poster reported or if the alternator has something to do with that.
  • greatcarsgreatcars Posts: 66
    It happened a couple of times that the remote key could not lock the car and I had to manually close each door. The battery may be low. Is this the sole reason?

    Any response to the replacement of battery? I think I have to replace it very soon. The MAXX-24S and MAXX-24FS at Walmart look so good but they were not listed for Tucson even though they have higher and better specs than the same book listed for Tucson. Can I use them safely and realiably? Thanks.
  • greatcarsgreatcars Posts: 66
    I copied this from another place:

    airflyte, "Hyundai Tucson Maintenance and Repair" #10, 13 Jan 2007 12:57 pm#9

    After my Tucson sits for two days, the battery goes dead. I took it to a Hyundai dealer and they showed me the Technical Service Bulletin for the Sonata, Tucson and Azera. The Bulletin number is 06-90-015, dated March 2006. The Bulletin states, "If the vehicle has to be stored for a long time, the power connector should be disconnected to prevent battery drain." I told the service manager that the car had only sat for two days, not for a long time. Their remedy was to pull the power connector (short connector) which is a 30amp fuse, located in the relay box passenger compartment. I would like to know if anyone else has this problem?

    On another board I frequent, one Tucson owner had the same type problem you are describing. In his case the problem turned out to be a problem with the factory radio. Maybe your dealer should check that out. At the very least they should be able to determine what devices/accessories are still drawing current when the vehicle is off.

    That bulletin 06-90-015 covers 2006-2007 model and said the radio is M280. But the M280 was used on 2005 model, too. So the battery problem on 2005 model is very likely caused by the radio, too.
  • TSB 07-90-007 came out in July 2007. It directly states:

    "Some Tucson vehicles equipped with the M280 audio receiver may exhibit a discharged battery if left parked, without being started or driven, for 2-3 days or more."

    It lists that a re-manufactured radio should be replaced (likely a previously broken one with the defect worked out).

    Take that TSB number to your dealer, and they should be able to help you.

    Search for that TSB number on the internet and you can actually obtain a direct printout of the TSB to take with you as well.
  • blisowskiblisowski Posts: 2
    thanks to edmunds i was able to have my radio replaced and eliminate dead battery problems. My car would go dead after a few days of not driving. The dealer said everything was fine but two weeks later same problem dead battery. I told of edmunds. com and similar problems they replaced m 280 radio and guess what--no more problems

  • If you have a Hyundai Tucson 2005 or later-and are having battery going dead problems-most likely you do have a parasitic drain problem going on-I did-but my dealership denied it at first! they did replace my battery the one time-but after it would sit for a while it went dead also-the radio in my car was faulty-and it would make the computer think that it was on-even though I did turn it off-and everything else with it-I LEFT NOTHING ON!!! it would still drain the battery because of this radio-I just wanted to let everyone else know that may be your problem also-and it's nothing you are doing!! I almost lost my job-having to get up and try and jump this new car off-not expecting to have any problems with it-It has a good warranty but if the dealership won't recognize there's a problem-then you've just got to show them there is a problem! Mine got fixed-have had no problems since!-If they don't want to accept there is a problem-leave it with them and they'll see within a day or two-it won't start! hope ya'll get what you need out of these dealerships-you just have to work them! and don't let them have any slack!!! And by all means-THANK YOU EDMUNDS!!! I WOULD NOT HAVE EVER FOUND THIS PROBLEM!
  • I have exactly the same problem with my 2007 Tucson. I have a battery charger permantly set up near my car so I can restart it in a hurry. It's a bit rediculous. I am going to store it at an airport in a few days so I'll probably have to unplub the battery before I leave. That will be difficult with a baby in a stroller at 5 a.m. but it will save me when I arrive home at 11 p.m. three nights later. Or I'll need to park near a power outlet somewhere!
    I'll look into the factory radio problem. Thanks for your advice. My problem is very randon. It only happens about once a week, but I don't use the car daily so it's probably those times I leave it for a couple of days. :confuse:
  • I'm having problems with battery drainage that has happened once a week for the last 3 weeks. The battery has been replaced and the problem still exists. My power door locks also lock/unlock by themselves or just don't work. My local garage hasn't been able to determine the problem and the dealer wants $125 just to diagnose if there is a problem. Any suggestions?
  • amt2amt2 Posts: 1
    I just read the post dated Feb 10, 2010 (6:15 pm). I am having the exact same problem with by battery drainage (have since replaced it) and my power door locks also lock/unlock by themselves or just don't work. I now manually lock my doors and have not had a dead battery since. Just wondering if there are any suggestions or could it possibly be the radio problem that is causing the battery to go dead as I have read in a previous post? Thanks for any help on this!
  • I had the same problem for a while. I replaced the car battery, and still had the problem with the locks.

    Took it into the dealer and they changed the computer that controls the security system. But I still had the problem.

    Finally, they changed the Drivers Door Master Switch (all the buttons in the driver side door armrest). They told me that Hyundai told them that they havd found that a bad door lock switch has sometimes caused this. On my repair slip they mention Case # 3707735. This has taken care of the problem. You guys may want to talk to you dealers about this. - CJ
  • ablumny1ablumny1 Posts: 1
    Hello. Our 05 Tucson suddenly went dead. I replaced the original battery and had the charging system checked, all was good. A week later, dead again.

    Coincidentally, a CD got stuck in the radio, then this problem appeared. If I have the described radio problem, does anyone think pulling the radio fuse would prevent the drain on the battery? I cant get to a dealer for a while.

  • I am so relieved to hear of others experiencing whay I have with my Hyundai Tucson (2005). Since purchase in 06' the battery has been draining consistantly. The first time they replaced it for free, the second charged me 157. for another battery. That one drained in 3 months, they kept telling me it was the battery and nothing else. I had repeatedly asked them to check the door locks and all they would do is hit the button and say "well they are working fine now". Finally I had it taken to the dealer across town (I live in Vegas) and they replaced a mechanism in the locks. They worked for about a day and then it went back to me having to open the manually - the battery still drained. After them sitting on it for three days and only unplugging the cables and plugging them back in, they tell me there is nothing they can find wrong - I am ready to scream. I have a compliant in with corporate to try to get my $157 back but they cannot ever seem to receive my fax...
    At this point I will never buy a hyundai again - which stinks because I really do love my car (when it starts...).
    I will have them check both of these issues AGAIN and hopefully something will get fixed-thanks so much for all of the information.
  • The door lock switch would usually work when I showed it to the dealer, but if we worked it several times in a row - say 5 or 10 - it would quit working, or switch some of the doors slowly or not at all. As I said in my previous post, Hyundai finally told them that there may be a problem with the door switch and after they changed it the problem was gone, and the battery quit draining. As I undersand it, the radio on my '05 Tucson was not one that was considered a problem. - CJ
  • tenpin288tenpin288 Posts: 804
    One more thing to check. There was a problem on some Tucsons with a mis-aligned underhood switch that is connected to the alarm/security system. If it is misaligned, the security system is constantly drawing power but there are no outward signs that is doing so. Worth a look.
  • For all the info, I am making a list for them to check off next time I bring it in, they are going to wish they sold me a car that works!
  • lunastar27lunastar27 Posts: 3
    edited October 2010
    I've read and I agree with yawl that the 2005 Hyundai Tucson Radio drains batteries dead, so I had the dealership mechanic remove my radio fuse, and two mechanics at the Wilmington Dealership told me that the Hyundai's Radios are terrible because they cause the drainage problems, so people just replace them because there are no good! So if by removing the radio fuse stops the problem wahooo, if not then back I go to Herb Chambers or Bill Dube Hyundai and fight again with both of them, it stinks that you have to holler and scream to make a point with these two dealerships, and my car is still under warranty and yet when I need service I get pushed aside, I have an electrical drainage problem and neither one wants to do the work on the car, so what good is a warranty when the dealership won't do the work on it? C'mon I bought the damn car because I liked the features and I felt secure and safe, but now I'm not so sure anymore! :confuse: :cry: and winter is coming and I've got this problem so everyday even weekends I have to start the car up so it won't die on me! that sucks!
  • I too have a 2005 Hyundai Tucson, and I'm on my 3rd battery, but this time I had the dealership mechanic remove the radio fuse, and now I'm hoping this stops the drainage! I will keep you posted, now if you let the car sits for 2 days the battery will
    turn up dead, then when AAA comes out to jump start, it's ok, then when you bring it to the dealership they say nothing's wrong with the battery, it's ok! then two weeks later is happens again same old thing happens, so with that said I blew my own fuse and told them to remove the radio fuse and now I see what happens next.
  • I have finally had my battery draining issue fixed! Or at least for the time being... My battery had gotten to the point that I had to buy a portable charging unit, Hyundai refused to extend my roadside even though I could plainly show that the only times I had called them out was due to this one issue that they could not fix. I even called corporate offices many times with no help whatsoever. My solution was not the radio though, it was the door locks. Funny how it took them three years and two dealerships to finally listen to me, I had mentioned the door locks being a problem from the very first visit - I had just stopped using the keyless entry in hopes that it would make the battery last a bit longer.
    I have also heard of an alarm switch that could cause the problem so don't stop with the radio if it continues. Unfortunately I don't think that it can be narrowed down to one specific issue with these cars, it seems there are many defects and the consumer just has to suffer while the dealerships play us for fools - this car should have been recalled completely.
    I'm sure they have also told you of a switch you can disconnect if your car will be sitting for a long time (long time to them is two days) so the battery will not drain. Might work better for you than having to start it up when you don't want to leave the house.
    Good luck :)
  • cmac66cmac66 Posts: 3
    In my 05 I replaced the radio after reading about the radio drainage. I did have the defective radio, and I replaced it with a Alpine from Crutchfields. Install was easy, and I added buletooth and iPod controls. So that is good. Now, two years later, I am getting erratic door lock issues - the locks turn on and off by themselves. I am not sure if I can assume it is the master (driver) door lock switch or if the security computer has to be changed. I am clearly out of warranty. Does anyone have any test or troubleshooting that might help me get started. I do not trust the dealers until I think I know what is wrong.
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