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Battery light came on 2006 Tundra DC 4x4

Discussion in 'Electrical' started by pb5690, Jul 11, 2021.

  1. Jul 11, 2021 at 4:49 PM
    #1
    pb5690

    pb5690 [OP] New Member

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    New member, first time posting. My battery warning light came on yesterday on my 2006 Tundra which is just shy of 200k miles. I went ahead and replaced the battery and the alternator, as well as the power steering pump(was leaking), and the idler pulley and tensioner. Started up and took for a test drive. After about a half hour the battery light came back on. I've checked all the connections, and cleaned the terminals at the battery, as well as the small ground on the side of the frame. At this point, I don't know what else to check. I followed the manuals suggestion of checking the battery with the vehicle off. It registered 12.6. Then when I started the vehicle it dropped to 11.28. According to the manual this indicates a bad alternator. Any other suggestions would be greatly appreciated.
     
  2. Jul 11, 2021 at 4:57 PM
    #2
    empty_lord

    empty_lord They see me rollin'

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    have you checked the make sure the alternator fuse is not blown, also where was the alternator from. i've had reman part store alternators bad out of the box
     
    frichco228 likes this.
  3. Jul 11, 2021 at 5:03 PM
    #3
    pb5690

    pb5690 [OP] New Member

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    Will check that fuse now. Alternator from Autozone.
     
  4. Jul 11, 2021 at 5:05 PM
    #4
    empty_lord

    empty_lord They see me rollin'

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    if you have a DVOM handy, the quickest test would be resistance from the alternator post to the positive battery post. should be under 1 ohm. this is safe to do with the battery connected. JUST DONT TOUCH THE NEGATIVE TERMINAL. or you'll pop the DVOM fuse
     
  5. Jul 11, 2021 at 5:25 PM
    #5
    pb5690

    pb5690 [OP] New Member

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  6. Jul 11, 2021 at 5:25 PM
    #6
    pb5690

    pb5690 [OP] New Member

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    Is the fuse underneath that screw terminal?
     
  7. Jul 11, 2021 at 5:27 PM
    #7
    empty_lord

    empty_lord They see me rollin'

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    the fuse is the big screwed in terminal. a volt meter is the best way to see if its open or not. theyre not fun to remove
     
  8. Jul 11, 2021 at 6:41 PM
    #8
    pb5690

    pb5690 [OP] New Member

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    Performed the test you indicated and with the Ohm meter set at 1, I touched one probe to the B+ terminal on the alternator and the other to the positive side of the battery. The battery was connected, and the key was off. The meter dropped to 0 on each test.
     
  9. Jul 11, 2021 at 6:48 PM
    #9
    empty_lord

    empty_lord They see me rollin'

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    not OL? then were good there. its likely a bum alternator from the store. but the next test i would do at work would be checking the alt-s fuse to the alternator (make sure that fuse inst blown either) if that wire is good, your charging system should function correctly

    ALT-S goes to one of the wires on the 4 pin connector. this is the voltage reference the voltage regulator sees, without it, the alternator will not charge.
     
  10. Jul 11, 2021 at 6:51 PM
    #10
    empty_lord

    empty_lord They see me rollin'

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    ALT-S to pin one of the 4 pin on the regulator of the alternator, should test below 1 ohm as well. perfect world, 0.
     

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  11. Jul 12, 2021 at 10:59 AM
    #11
    pb5690

    pb5690 [OP] New Member

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    Thanks for the schematic @empty_lord. The ALT-S 7.5 amp fuse tests good. So I got in to the main fuse box and removed the 2 large fuses that are in their own compartment on the left side of the main fuse box under the hood. As you stated above, not an easy task. I highlighted the area in the photo where I removed them from.

    20210712_082823.jpg
     
  12. Jul 12, 2021 at 11:16 AM
    #12
    pb5690

    pb5690 [OP] New Member

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    I went to the dealer and they had one of them in stock, and I ordered the other one. The one they had in stock is what I'm calling #31 on the fuse box diagram for a 2006 Tundra DC. Its a 60amp fuse with the following description, 2005-2006: "TOWING TAIL”, "BATT CHARGE” and "TOWING BRK” fuses. I took a few pics of the old one, which shows either corrosion or "burning". I also attached a pic of the new fuse as a comparison. I will put it in this evening and see if anything happens. I'm hopeful since "BATT CHARGE" is actually listed in the description of this fuse. From your experience, could the corrosion you see on the old fuse be enough to cause the light to come on?20210712_103251.jpg 20210712_103251.jpg 20210712_103241.jpg
     
  13. Jul 16, 2021 at 2:47 PM
    #13
    pb5690

    pb5690 [OP] New Member

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    Problem solved, @empty_lord you were correct sir, it ended up being the "new" alternator that I had just purchased from Autozone and installed. It was bad straight out of the box. Took it back and got a refund. Put another one on and the battery warning light went out. The good thing is because of this forum and some of the suggestions I learned how to perform a lot of really good checks on fuses, connections, and cables. Thanks for the help.
     
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  14. Jul 16, 2021 at 4:43 PM
    #14
    empty_lord

    empty_lord They see me rollin'

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    Good to hear you got it all sorted. Sorry I never replied on the post before about the fuse, never got a notification about it.
    Any time you need some help post up in the 1st gen section and feel free to @ me
     
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