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Agm battery charging..

Discussion in '2.5 Gen Tundras (2014-2021)' started by Mrf1987, Nov 2, 2021.

  1. Nov 6, 2021 at 12:17 PM
    #31
    e30cabrio

    e30cabrio I'm e30cabrio, I'm a modaholic

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    That is the fuse rating. I bought the 5amp for my 2010 Tundra but they were out of stock at the time so I got the 7.5.
     
    PWMDMD likes this.
  2. Nov 6, 2021 at 12:26 PM
    #32
    Vr0ck

    Vr0ck New Member

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    I ended up picking up a littelfuse 1amp from o'reilly auto for $4 and change to use with a diehard agm 24F.
     
  3. Nov 10, 2021 at 8:18 AM
    #33
    Tundradrenalin

    Tundradrenalin New Member

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    my UltraGauge shows 14.3V typically, never seen it over 14.7V.
     
  4. Nov 10, 2021 at 8:24 AM
    #34
    Mrf1987

    Mrf1987 [OP] New Member

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    finished up the install
    I installed the fuse you provided a link for off of ebay and everything is working appropriately. I am seeing about 14.6/14.7 at startup and it levels off around 14.2-14.4 until the battery demands more than it goes back up.
     
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  5. Nov 10, 2021 at 8:44 AM
    #35
    hagrid

    hagrid It's called "satire"... look it up.

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    Good Lord, I hope not. Need to save money for fuel.
    Wait...

    Are you saying the charge voltage never goes below 14.2?
     
  6. Nov 10, 2021 at 9:20 AM
    #36
    Mrf1987

    Mrf1987 [OP] New Member

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    Correct, the agm batteries need a higher voltage to recieve a full charge. It says right atop of the x2 battery i have. This is a known modification to perform to get the most out of your agm battery without having to use a plug in charger every now and then.
     
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  7. Nov 10, 2021 at 11:00 AM
    #37
    hagrid

    hagrid It's called "satire"... look it up.

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    Good Lord, I hope not. Need to save money for fuel.
    If the battery never reaches saturation then I suppose its OK.
     
  8. Nov 30, 2021 at 10:23 AM
    #38
    F0X672

    F0X672 New Member

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    Needing some clarity here, doing the GM diode/fuse swap with the ALT-S fuse, is the GM diode also fused or is it strictly a diode? Looking at the wiring diagram for my 2016 and knowing where the fuse is and how the sense wire is run down to the regulator on the alternator, I'm sure as soon as I pop in that diode is the day that wire chaff's, grounds out, catches fire and burns my truck down lol. This concern is also aside from forcing the charging system to work a little "harder" chancing an earlier failure. Ultimately, anyone have insight if the GM diode 12135037 is also fused?
     
  9. Nov 30, 2021 at 12:15 PM
    #39
    Mrf1987

    Mrf1987 [OP] New Member

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    From what i have gathered the gm diode is not fused it is just A diode. I purchased this fused diode off ebay and it is working just fine.

    https://www.ebay.com/itm/164706700869
     
  10. Nov 30, 2021 at 4:33 PM
    #40
    F0X672

    F0X672 New Member

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    Looks like someone just cut the pigtail off an add a circuit and added a diode, making a series circuit with the fuse and diode.

    I had my doubts on the GM and one but everywhere you look up it's part number, it's listed as multifunction. At first I was wondering whats multifunctional about it but I'm thinking it's multi application, usable for other various circuits and electrical components.
     
  11. Dec 8, 2021 at 9:57 PM
    #41
    daveeasa

    daveeasa New Member

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    What a great grinchy trick!

    16501AB8-66F4-49D2-A769-B67F5D67F39B.jpg
     
  12. Dec 8, 2021 at 10:11 PM
    #42
    1lowlife

    1lowlife Toxic prick and pavement princess..

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  13. Dec 9, 2021 at 1:08 AM
    #43
    F0X672

    F0X672 New Member

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    I got a little creative, soldered 2 ATM fuse holders lying around, soldered in a low pro fuse tap, and bought the GM diode. Gave myself extra length on the wire so I can tuck it in the open pocket of the fuse box. I'll give this a try in the morning.

    20211208_181432.jpg
     
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  14. Dec 9, 2021 at 5:18 AM
    #44
    NewImprovedRon

    NewImprovedRon Hey! Get off my grass!

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    Let us know how it works out..
     
  15. Dec 9, 2021 at 6:48 AM
    #45
    Ericsopa

    Ericsopa Old man and the sea

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  16. Dec 9, 2021 at 7:32 AM
    #46
    Vr0ck

    Vr0ck New Member

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  17. Dec 9, 2021 at 8:18 AM
    #47
    Paulismydog

    Paulismydog New Member

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    My 2020 limited has the 5 amp alt s fuse. I assume I can use a hkb diode. I see two options. The micro blade and the mini blade. Any suggestions as to which of the two I should get. Thanks. Bob
     
  18. Dec 10, 2021 at 11:32 AM
    #48
    F0X672

    F0X672 New Member

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    So far so good. I probably have about $25 total invested into this little upgrade including the diode. Didn't grab a picture but the alternator is originally charging at 13.87v. A .55 volt gain, good enough for me. Going to keep an eye on it, just mildly concerned about the longevity of the alternator in the end.

    20211210_135220.jpg
    20211210_135251.jpg
     
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  19. Dec 11, 2021 at 5:43 AM
    #49
    NewImprovedRon

    NewImprovedRon Hey! Get off my grass!

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    Thanks for the follow up!
     
    F0X672 likes this.
  20. Jan 14, 2022 at 11:42 PM
    #50
    MadMaxCanon

    MadMaxCanon New Member

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    Too many, but not enough....
    Does anyone have a rule of thumb as to when you know you need an agm? I'll be running a winch, lightbar, couple light pods and a few low power goodies, I'm pretty sure nobody would argue the additional load on the truck but is frequency of usage the main factor?
     
  21. Jan 15, 2022 at 1:31 AM
    #51
    thearborbarber

    thearborbarber New Member

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    I ran a load similar to that on my old 91 suburban with an Interstate battery and an anemic 105 amp alternator. I had a couple of long winch pulls with it too.
     

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