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Dual alternators for 4.0L

Discussion in '2nd Gen. Tacomas (2005-2015)' started by turbo598, Jul 7, 2021.

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  1. Jul 7, 2021 at 6:42 AM
    #1
    turbo598

    turbo598 [OP] Active Member

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    Does any body know of anybody that would like or need to mount a second alternator on their truck?
    I made a bracket that will mount a GM bolt pattern 370amp hair pin alternator to any 4.0L Toyota engine.

    I picked the GM alternator because it is has the most options of all aftermarket Hairpin alternators.

    With a DC power 270dx in the stock location and a Autotech 370 I am putting out 408 amps at idle and 622 amps while cruising. Both alternators are Denso hairpin style alternators.

    I believe that with this set up you will be able to power larger inverters, winch, and off road lights without issue.

    I am trying to gauge interest to see if I should offer kits for sale and or local installation. I will see if i can post some pictures later.
     
  2. Jul 7, 2021 at 6:44 AM
    #2
    Sandman614

    Sandman614 Ex-Snarky TWSS elf, Travis #hotsavannahdotcom

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    This is already done with just a 2nd battery.

    But I think this would be more geared to the "Big Audio" guys

    Pics?
     
  3. Jul 7, 2021 at 1:58 PM
    #3
    TnShooter

    TnShooter The TacomaWorld Stray

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    Hey there and Welcome to TW!
    Before you offer to sell the bracket or kits.
    I encourage you to read the Buy/Sale/Trade FAQ.
    https://www.tacomaworld.com/threads/buy-sell-trade-rules-rev-2019.2577/

    Normally, I wouldn’t even bother telling you.
    The moderators usually take care of it.
    As of now, you look to be all clear. As you are only gauging interest:thumbsup:

    I’m seriously not picking on you either.
    I’ve never seen this done. And find it quite interesting.
    Hopefully it works out, this could be a good product.

    Looking forward to seeing the pictures.
     
    Bivouac and ahspurlock like this.
  4. Jul 7, 2021 at 2:01 PM
    #4
    TheOnlyPajooned

    TheOnlyPajooned Well-Known Member

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    she got big shoes bro
  5. Jul 7, 2021 at 9:22 PM
    #5
    6 gearT444E

    6 gearT444E Certified Electron Pusher

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    "I am putting out 408 amps at idle and 622 amps while cruising" What loads are you drawing that require this? Do you mean, you have the capability to put out those loads? Current is only fed to the power device that is requiring it; otherwise you have alot of potential energy sitting there waiting to be used.

    I've never seen a car draw more than 50-60 amps even with the bright lights on and maybe putting down all 4 windows at once with the AC running. Why you'd need 622 amps is beyond me unless you are running a mobile concert truck.
     
    Jimmyh likes this.
  6. Jul 8, 2021 at 12:24 AM
    #6
    TacoTuesday1

    TacoTuesday1 Well-Known Member

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    don't cop cars get by with just 1 heavier duty alternator instead of 2
    isn't there a fab shop that sells an upgrade kit
     
  7. Jul 8, 2021 at 3:26 AM
    #7
    Inbred

    Inbred Well-Known Member

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    I think this may be the dude thats got a business where he quick charges Tesla’s while in motion on the highway. Bumper to bumper with a six foot retractable pole he can charge ‘em to 100 percent in only 30 miles.
     
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  8. Jul 8, 2021 at 4:16 AM
    #8
    turbo598

    turbo598 [OP] Active Member

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    I was using this for Ham radio. I am now using this power for a competition audio system. I think the Overland group would be able to use the added power so they would not have to pack a generator. A 270 alt and 2 batteries will only go so far.
    Here are some pictures as promised.


    IMG_1388.HEIC.jpg IMG_1392.HEIC.jpg IMG_1401.HEIC.jpg IMG_1394.HEIC.jpg
     
    Last edited: Jul 8, 2021
    rob1208, Lohan808, shmn and 4 others like this.
  9. Jul 8, 2021 at 5:15 AM
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    Sandman614

    Sandman614 Ex-Snarky TWSS elf, Travis #hotsavannahdotcom

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    Kinda hard to get a good picture down there. What planet were you able to talk to with that much current draw from a Ham radio? What antenna were you pushing that through? As I suspected, big audio, try posting in the audio section.


    [​IMG]
     
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  10. Jul 8, 2021 at 6:22 AM
    #10
    6 gearT444E

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    Looks nice. How have you handled the load sharing and voltage regulation?
     
  11. Jul 8, 2021 at 6:33 AM
    #11
    montijo505

    montijo505 Moon soon?

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    And, you guessed it, dual batteries
     
  12. Jul 8, 2021 at 7:52 AM
    #12
    turbo598

    turbo598 [OP] Active Member

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    Both alternators are on one battery you can see both of the 4/0 cables on the positive battery terminal. This has been running for 4200 miles so far with out issue. Both Alts are putting out 14.4-14.6 volts. Both alternators load and unload about the same time. There are no issues sharing one battery.

    I made the comment about a 270 alt and 2 batteries because another post said that this has been done all ready and that is all you need. I am running one battery and 2 alternators. I will add more batteries soon for storage.

    I get it. This is not for everybody. This is for the people that want redundancy and a lot of power for running inverters and other loads when no genset is available.

    With the right inverter this should make 30-40 amps @ 120vac while idling.
     
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  13. Jul 8, 2021 at 7:55 AM
    #13
    EatSleepTacos

    EatSleepTacos Well-Known Member

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    Sheesh, you could run a welder off of that and have juice to spare.
     
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  14. Jul 8, 2021 at 7:57 AM
    #14
    WRDD Taco

    WRDD Taco Big Hobby Guy

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    TC Mid Travel +2, TC SUA, king shocks, Swamp Donkey/Rigid lighting, Mechman alt, SOS/Boztek armor, ATH Fab tiedown, full active JL/Audiofrog sound system, NOICO sound deadening EVERYWHERE. Up next: roof/bed rack + dry storage, skids, bumpers, fiberglass, power wire upgrade + frame grounds, LTO battery swap, air compressor, on board pressurized water, powered cooler, suspension seats, frame reinforcement, solid motor/trans mounts.
    Oh heck yeah I’ve been waiting on something like this for years!
     
  15. Jul 8, 2021 at 8:00 AM
    #15
    WRDD Taco

    WRDD Taco Big Hobby Guy

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    I am into car audio and high powered amplifiers around 10,000 watts require about 700amps at max draw. I actually had one that I sold because I thought I would never be able to use it in the Tacoma. :annoyed:
     
  16. Jul 8, 2021 at 8:03 AM
    #16
    WRDD Taco

    WRDD Taco Big Hobby Guy

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    To power stuff like this... 86E750F2-4856-4F02-AD3C-9EB61B81A17F.jpg
     
  17. Jul 8, 2021 at 8:10 AM
    #17
    turbo598

    turbo598 [OP] Active Member

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    My ham radio and inverter would kill my battery pretty fast with a 270dx alt and one battery. Adding a second battery would only let run a little longer.

    I pulled out that gear and now am working on a big system with my son. We will use all that power and still need more.
     
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  18. Jul 8, 2021 at 8:14 AM
    #18
    turbo598

    turbo598 [OP] Active Member

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    Nice,

    I will post some pics of my system in the audio section later
     
    WRDD Taco[QUOTED] likes this.
  19. Jul 8, 2021 at 8:17 AM
    #19
    Sandman614

    Sandman614 Ex-Snarky TWSS elf, Travis #hotsavannahdotcom

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    Facemelting power!
     
  20. Jul 8, 2021 at 8:56 AM
    #20
    nudavinci64

    nudavinci64 Taco Outlaw

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    Boosted Money Pit....
    that would be a crazy setup for sure. the 270 alone is likely more than enough. I have been running with offroad (with solar and dc charger) without issues but was looking at adding the 270 DC alt you noted. Talking with them that would be more than enough for anything we can toss at it. Curious to see how 2 alternators would go
     
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