1. Welcome to Tundras.com!

    You are currently viewing as a guest! To get full-access, you need to register for a FREE account.

    As a registered member, you’ll be able to:
    • Participate in all Tundra discussion topics
    • Transfer over your build thread from a different forum to this one
    • Communicate privately with other Tundra owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site

Agm battery charging..

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

  1. Feb 9, 2022 at 7:18 PM
    #61
    Luke_Skywalker

    Luke_Skywalker New Member

    Joined:
    Mar 4, 2021
    Member:
    #59981
    Messages:
    214
    Gender:
    Male
    First Name:
    Luke
    Vehicle:
    2020 Tundra TRD Pro
    Eibach TRD Pro Front Springs, Dirt King UCA's Coachbuilder +3 shackle (poly bushings)/carrier bearing drop, steering upgrade, bumper shims, White Knuckle Sliders, Leitner Designs, Baja Designs, Switch Pro, Victron Solar, BORA 1.25", BFG KO2s, Wheelers Superbumps, VLED interior lights, 12" Sub, Window Tint.
    This ^.

    Granted the 27F X2 battery i have is in my FJ. I am getting a new fuse to bump up alternator charging as well, and lastly im getting a hood mounted solar because they make one for the FJ that fits like a glove over the already existing viynl i have. Doing the solar more for long trips than for the charging though.

    I bought a Ctek 5 AMP charger from Amazon for 80 or so bucks. It works a treat. I plug the FJ in once a week and all is well.

    There are options for solar hood panels for Tundra as well if you think thats your style, but if you plug it into a proper AGM charger like a ctek once a week you will be totally fine.
     
  2. Feb 19, 2022 at 5:11 AM
    #62
    crishard

    crishard Occasional Member

    Joined:
    Nov 2, 2016
    Member:
    #5065
    Messages:
    120
    First Name:
    Cris
    Vehicle:
    2014 Barcelona Red CM
    3" level in front, ICI Bumper & Skid, 12k lb winch, UCAs, Radtech 2.5s, Kenda 35s, Dual Batteries, 3500w inverter
    Anyone else have any issues with the gm diode? Mine melted & caused electrical issues with my turn signals. I'm pretty sure it was in correctly. Ran it for over a month, before the meltdown, & never noticed my voltmeter being over 14
     
  3. Feb 19, 2022 at 5:31 AM
    #63
    Danman34

    Danman34 New Member

    Joined:
    Sep 19, 2018
    Member:
    #19579
    Messages:
    2,229
    Gender:
    Male
    First Name:
    Danny
    Vehicle:
    2018 White Tundra TRD Sport
    It’s an electrical component and go bad like anything else. Either way, the voltage is regulated on these trucks for a reason. So running these diodes to simply charge a battery that isn’t designed to work in with our electrical system just blows my mind. Any blip of unregulated voltage could fry the ecu or….light bulb sockets.
     
    RitcheyRch and Wallygator like this.
  4. Feb 22, 2022 at 11:48 AM
    #64
    acmesupply

    acmesupply New Member

    Joined:
    Dec 9, 2016
    Member:
    #5501
    Messages:
    205
    Vehicle:
    2018 SR5 CM Silver TRD
    I have a bag of 5 brand new ones I will send you if you PM me.
     
    NewImprovedRon and HulkSmurf14 like this.
  5. Feb 24, 2022 at 6:47 AM
    #65
    crishard

    crishard Occasional Member

    Joined:
    Nov 2, 2016
    Member:
    #5065
    Messages:
    120
    First Name:
    Cris
    Vehicle:
    2014 Barcelona Red CM
    3" level in front, ICI Bumper & Skid, 12k lb winch, UCAs, Radtech 2.5s, Kenda 35s, Dual Batteries, 3500w inverter
    @acmesupply thanks very much for the offer. I bought one recently with the intent of trying again but I'm hesitant. I'm either gonna go the diy fused diode or the HKB route. Either way, my main AGM battery is now dead. Luckily I have a two AGM battery set up & I can connect the batteries to jump myself.

    Edit: Apparently my main battery isn't dead. It has 12.2v & 14.2v when idling but won't start the truck unless I connect the batteries. My agm states 14.4v +-.2v
     
    Last edited: Feb 24, 2022
  6. Feb 24, 2022 at 7:33 AM
    #66
    VWTim

    VWTim Mid-Travel Crew

    Joined:
    Mar 1, 2021
    Member:
    #59814
    Messages:
    591
    Gender:
    Male
    Corvallis, OR / Austin, TX
    I've been running a Ford diode for the past year in my 07 with an X2 AGM main battery and a group 24 house battery connected via a smart isolator.

    No issues so far and it bumped up the charge voltage similar to what others are saying.
     
  7. Apr 9, 2022 at 8:53 AM
    #67
    Yzed608

    Yzed608 New Member

    Joined:
    Jul 1, 2017
    Member:
    #8351
    Messages:
    981
    Gender:
    Male
    Wisconsin
    Thanks for posting this. I just got the GM diode but haven't installed because I really don't like that it wouldn't be fused anymore. I'll be copying this and should make me feel better about adding it in.
     
    F0X672[QUOTED] likes this.
  8. Jun 2, 2022 at 1:37 PM
    #68
    Totmacher

    Totmacher New Member

    Joined:
    Nov 21, 2020
    Member:
    #55182
    Messages:
    249
    Gender:
    Male
    First Name:
    Daniel
    West TN
    Vehicle:
    mesquite Tundra or blue 4Runner
    Some
    My 27f Northstar AGM is in its 6th year and running fine with no charging or diodes or anything special. :notsure:
    Was in a tacoma and then moved it to 4runner.
     
  9. Jun 2, 2022 at 7:22 PM
    #69
    HulkSmurf14

    HulkSmurf14 ...Weighted Average...

    Joined:
    Aug 9, 2019
    Member:
    #34377
    Messages:
    2,000
    Gender:
    Male
    Vehicle:
    2014 Tundra Limited
    Tastefully enhanced...
    How old were they? Above 5th gen on 4runner and above 3rd gen on Taco?
     
  10. Jun 2, 2022 at 8:47 PM
    #70
    Yzed608

    Yzed608 New Member

    Joined:
    Jul 1, 2017
    Member:
    #8351
    Messages:
    981
    Gender:
    Male
    Wisconsin
    I just realized I never replied here, linking my other post:
    So far so good with it. Haven't had any issues so far with the 1.5 years without it, but if it can help longevity why not try I guess. Obviously it's easily reversible.
     
    HulkSmurf14 likes this.
  11. Jun 2, 2022 at 8:52 PM
    #71
    Cruzer

    Cruzer Wheeling Full Size

    Joined:
    Oct 12, 2020
    Member:
    #53461
    Messages:
    3,186
    Gender:
    Male
    First Name:
    Cruz
    Sunnyvale, CA
    Vehicle:
    Build Page: Cruzer's Re-Build for the Rubicon
    Had an agm without the proper voltage for 3 years and it worked fine, until it didn’t.
     
    619Tundra, HulkSmurf14 and des2mtn like this.
  12. Jun 2, 2022 at 9:16 PM
    #72
    Yzed608

    Yzed608 New Member

    Joined:
    Jul 1, 2017
    Member:
    #8351
    Messages:
    981
    Gender:
    Male
    Wisconsin
    Did it show any signs before going kaput? Obviously our voltage gauge on the dash isn't finite enough to be able to tell 0.5V, but curious if it had low voltage for a bit or something.
     
  13. Jun 2, 2022 at 11:28 PM
    #73
    Cruzer

    Cruzer Wheeling Full Size

    Joined:
    Oct 12, 2020
    Member:
    #53461
    Messages:
    3,186
    Gender:
    Male
    First Name:
    Cruz
    Sunnyvale, CA
    Vehicle:
    Build Page: Cruzer's Re-Build for the Rubicon
    Oh yeah, I would see the headlights momentarily dim whenever I would turn on any of the auxiliary lights (lights bars, etc), then cranking would at times struggle. One day it just wouldn’t start. Trickle charged it and it was good for a little bit but would not hold its charge. After charging it several times I gave up and bought a new one and the diode. Now I constantly watch my voltages as I drive and can clearly see when it’s being charged by the alternator at 14.5v and when it backs off at around 14v.
     
    619Tundra and Yzed608[QUOTED] like this.
  14. Jun 3, 2022 at 10:38 AM
    #74
    Totmacher

    Totmacher New Member

    Joined:
    Nov 21, 2020
    Member:
    #55182
    Messages:
    249
    Gender:
    Male
    First Name:
    Daniel
    West TN
    Vehicle:
    mesquite Tundra or blue 4Runner
    Some
    5th gen 4R (2018) and 2nd gen tacoma (2015). Ran it on taco about a year before swapping into 4R.

    I had also put an AGM in a 2013 Scion FRS. No problems at all for the 1.5 years running it before I sold the car.
     
    HulkSmurf14[QUOTED] likes this.
  15. Jun 3, 2022 at 7:39 PM
    #75
    HulkSmurf14

    HulkSmurf14 ...Weighted Average...

    Joined:
    Aug 9, 2019
    Member:
    #34377
    Messages:
    2,000
    Gender:
    Male
    Vehicle:
    2014 Tundra Limited
    Tastefully enhanced...
    Hmmm, the older trucks had less issues due to more simple ECU...I'd say you got lucky! Either that or I am just unlucky...my MIL's '15 gx460 had issues without the diode as well as my SIL's 5th gen 4runner.. was perfect for a couple years than sh!t the bed.. now, good to go...
     
  16. Jun 13, 2022 at 10:04 AM
    #76
    shawn474

    shawn474 Lego connoisseur

    Joined:
    Jul 23, 2019
    Member:
    #33569
    Messages:
    2,215
    Gender:
    Male
    MoCo, Maryland
    Vehicle:
    2019 Cement Tundra crew max TRD Off Road
    I was at a jeep festival in pennsylvania this weekend and visited the optima booth. Asked them about my agm artery for the tundra and the limitations of charging for the Toyota (ie- needing to install the diode). He said he didn’t have any knowledge of that and that he was going to research and get back to me - took my email. I don’t have any expectation that he actually will but I am still nervous installing the diode. I bought the optima battery maintainer last month and will hook it up once every few weeks overnight.

    If I ever hear back from them, I will update the forum.
     
  17. Jun 13, 2022 at 11:08 AM
    #77
    dkrou

    dkrou New Member

    Joined:
    Dec 13, 2020
    Member:
    #56121
    Messages:
    435
    Gender:
    Male
    First Name:
    dan
    Vehicle:
    2019 tundra
    coldcanuk and Sonicbluerider like this.
  18. Jun 14, 2022 at 7:15 AM
    #78
    dkrou

    dkrou New Member

    Joined:
    Dec 13, 2020
    Member:
    #56121
    Messages:
    435
    Gender:
    Male
    First Name:
    dan
    Vehicle:
    2019 tundra
    619Tundra likes this.
  19. Jun 14, 2022 at 7:31 AM
    #79
    dkrou

    dkrou New Member

    Joined:
    Dec 13, 2020
    Member:
    #56121
    Messages:
    435
    Gender:
    Male
    First Name:
    dan
    Vehicle:
    2019 tundra
    Did you need to modify the tray or anything to hold the extra weight of the 31...isn't that like 75 lbs?
     
  20. Jun 15, 2022 at 6:02 AM
    #80
    Mrf1987

    Mrf1987 [OP] New Member

    Joined:
    Sep 2, 2020
    Member:
    #51663
    Messages:
    244
    Gender:
    Male
    First Name:
    Matt
    Vehicle:
    2020 Trd sport tundra
    Yes i bought a battery tray from rago fabrication.
     
  21. Jun 15, 2022 at 6:22 AM
    #81
    dkrou

    dkrou New Member

    Joined:
    Dec 13, 2020
    Member:
    #56121
    Messages:
    435
    Gender:
    Male
    First Name:
    dan
    Vehicle:
    2019 tundra
    Not sure I would ever go there...have to wait until my X2 27f dies on me I guess. Thanks for the reminder I forgot they sold trays for these.
     
  22. Jun 15, 2022 at 6:26 AM
    #82
    Mrf1987

    Mrf1987 [OP] New Member

    Joined:
    Sep 2, 2020
    Member:
    #51663
    Messages:
    244
    Gender:
    Male
    First Name:
    Matt
    Vehicle:
    2020 Trd sport tundra
    Not a problem. what accessories are you running? i just added a 100ah lithium in my bed with a redarc dcdc charger as well.
     
    Wallygator and Cruzer like this.
  23. Jun 15, 2022 at 6:30 AM
    #83
    dkrou

    dkrou New Member

    Joined:
    Dec 13, 2020
    Member:
    #56121
    Messages:
    435
    Gender:
    Male
    First Name:
    dan
    Vehicle:
    2019 tundra
    I have just a ton of Baja Design lights both front roof and rear some of which I use when the engine isn't running.....I also just added a dash cam that runs a minimum of 6 hours in park mode so this battery has helped on that and prevented the need for the parking mode battery pack.

    IMG_4729.jpg

    image1 hunting snow.jpg
     
    ToyoMafia and Wallygator like this.
  24. Jun 15, 2022 at 6:35 AM
    #84
    Mrf1987

    Mrf1987 [OP] New Member

    Joined:
    Sep 2, 2020
    Member:
    #51663
    Messages:
    244
    Gender:
    Male
    First Name:
    Matt
    Vehicle:
    2020 Trd sport tundra
    Sweet! Yea I’ve got a pile of lights front and back as well as a dometic 95dz in the bed. I used a lot of the battery up front that’s why i decided on adding the lithium.

    D393F8D7-9659-4CA4-89CB-5DDC39E35BAB.jpg
    97845B32-9C40-49F0-A65F-0790E7C563DE.jpg
     
    Wallygator and JCBerb like this.
  25. Jun 15, 2022 at 7:44 AM
    #85
    dkrou

    dkrou New Member

    Joined:
    Dec 13, 2020
    Member:
    #56121
    Messages:
    435
    Gender:
    Male
    First Name:
    dan
    Vehicle:
    2019 tundra
    What rack is that...curious too on yr snorkel. Only drive thru water once in a great while but think they look cool. Added the hunting pic to my post above. I'd love to get a swing out bumper for a spare tire too...not sure who makes those for a tundra.
     
  26. Jun 15, 2022 at 7:50 AM
    #86
    Mrf1987

    Mrf1987 [OP] New Member

    Joined:
    Sep 2, 2020
    Member:
    #51663
    Messages:
    244
    Gender:
    Male
    First Name:
    Matt
    Vehicle:
    2020 Trd sport tundra
    Haha good deal man! nice to see a fellow waterfowl hunter. The rack is a princu and the snorkel is a dobinsons with a @snorkelupgrade top. The snorkel does more than protect against water. it really shines on dusty trails or roads. It keeps the filter much cleaner. My bumper is a high clearance from @sobfabrication. You have to cut the bedsides but it is the best built designed bumper out there for the tundra in my opinion. Here are some pics

    4D675D34-9643-420A-B078-D4961BC7C383.jpg
    D4E9D1AE-CBD9-4A73-975E-74FB307ED821.jpg
    3B2EBEE8-8EAD-4E44-B780-D65AEEC2AB33.jpg
     
    RJVA, Wallygator, JCBerb and 2 others like this.
  27. Jun 15, 2022 at 8:15 AM
    #87
    texasrho83

    texasrho83 DGAF#1

    Joined:
    Mar 30, 2017
    Member:
    #7025
    Messages:
    9,315
    Gender:
    Male
    First Name:
    Charles
    Conroe TX
    Vehicle:
    2016 DC MGM 4x4
    See build link
    Still using my stock battery tray with no issues.
     
  28. Jun 15, 2022 at 8:16 AM
    #88
    Cruzer

    Cruzer Wheeling Full Size

    Joined:
    Oct 12, 2020
    Member:
    #53461
    Messages:
    3,186
    Gender:
    Male
    First Name:
    Cruz
    Sunnyvale, CA
    Vehicle:
    Build Page: Cruzer's Re-Build for the Rubicon
    Same here.
     
    texasrho83[QUOTED] likes this.
  29. Jun 16, 2022 at 5:05 AM
    #89
    dkrou

    dkrou New Member

    Joined:
    Dec 13, 2020
    Member:
    #56121
    Messages:
    435
    Gender:
    Male
    First Name:
    dan
    Vehicle:
    2019 tundra
    very nice....I would be nervous about cutting into the truck. It looks like a fantastic bumper.
     
  30. Jun 18, 2022 at 9:04 AM
    #90
    Ghost Rider

    Ghost Rider Mods wouldn't be an issue if money wasn't.

    Joined:
    Jul 7, 2021
    Member:
    #65274
    Messages:
    938
    Gender:
    Male
    First Name:
    Ian
    Cypress, Texas
    Vehicle:
    2021 White Tundra CM SR5
    Just a quick question, Rago only has them for 2nd gen, but running a 2021 CM, would it fit? I guess I am more worried about the mounting spots than anything else, that 31 battery weights 78lbs and ain't fun to have it roll and fall off something....
     
To Top