1. Welcome to Tacoma World!

    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 Tacoma discussion topics
    • Communicate privately with other Tacoma owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site

double battery wiring?

Discussion in '1st Gen. Tacomas (1995-2004)' started by OddSmurf1492, Aug 6, 2009.

  1. Aug 6, 2009 at 10:30 PM
    #1
    OddSmurf1492

    OddSmurf1492 [OP] Member

    Joined:
    Jun 18, 2009
    Member:
    #18641
    Messages:
    13
    Gender:
    Male
    MN
    Vehicle:
    99 2.4 5spd base
    how would you guys suggest doing wiring up a double battery set up?

    i have a basically brand new battery that came from my uncles ranger before the engine blew and was thinking of getting a battery tray and mounting it behind the air box. i plan on running a "few" lights and such hehe

    pos to pos/neg to neg?
    engine to pos of bat1, neg of bat1 to pos of bat2, neg of bat2 to original neg?

    what size wires?

    any fusing necessary?
     
  2. Aug 6, 2009 at 10:34 PM
    #2
    DanGer

    DanGer Avatar approved by 98tacomav6

    Joined:
    Jun 7, 2008
    Member:
    #7155
    Messages:
    5,494
    Gender:
    Male
    Northern Virginia & Blacksburg
    Vehicle:
    07 Base 4Cyl 4x4 Manual
    White Head Light mod, White shorty antennae, Doug Thorley Long Tube headers, AFE Drop in air filter, Secondary Air Filter Removed,
    good question, I am subscribed to see the answer
     
  3. Aug 6, 2009 at 11:30 PM
    #3
    rblloyd

    rblloyd Member

    Joined:
    Nov 2, 2008
    Member:
    #10448
    Messages:
    16
    Gender:
    Male
    Vehicle:
    1999 2.7L SR5 Tacoma 4x4
    There are two ways to do it:

    One is to wire both batteries together in the fashion that you mentioned. This would create a series circuit. There are a few problems with this setup. One is that the batteries are constantly connected meaning if you run them down they will both run down together. Your spare battery can not be run down without running down your starter battery. Also, it can be hard on your alternator if both batteries are run down extremly low because it has to charge both at the same time. Often times two batteries in series will pull more amps than the alternator is made to deliver.

    The second (and better way) to do it is to buy a battery isolator that can be placed in between the batteries. It is a device that will connect the batteries to the alternator when the truck is running in order to charge them, but will disconnect them when the engine is shut off so that the spare battery can be used till it dies without running your starting battery down. This setup is often used in inverter setups and motorhomes.

    You should be able to purchase an isolator at any auto parts store or maybe an RV shop.
     
  4. Aug 6, 2009 at 11:46 PM
    #4
    johnecon2001

    johnecon2001 Well-Known Member

    Joined:
    Apr 26, 2009
    Member:
    #16456
    Messages:
    1,019
    Gender:
    Male
    Phoenix, AZ
    Vehicle:
    2005 TRD Sport 4x4 Access Cab
    Downey front skid, Trail Gear U-Bolt flip, Toytec AAL, Total Chaos UCA's, Bilstein 5100's x4 + Eibach adjustable coils, Doug Thorley Long Tube Headers, Custom Rear bumper, TRD OffRoad front tow hook, TRD Trail Team wheels, Federal Couragia M/T 265's, ARB rear locker + on board air (CKMA12), TRD shift knob, Alpine W205, TRD seat covers, Tom Woods 1 Piece drive shaft, Powermaster D2700, Stubbs HD-SKO Sliders.
    It's actually called parallel wiring. Series would be positive to negative and would double the voltage to 24v.
     
  5. Aug 7, 2009 at 9:47 AM
    #5
    rblloyd

    rblloyd Member

    Joined:
    Nov 2, 2008
    Member:
    #10448
    Messages:
    16
    Gender:
    Male
    Vehicle:
    1999 2.7L SR5 Tacoma 4x4
    YA, im sorry i meant parallel... my bad.. Im used to working on CAT excavators and dozers that all run on 24v!
     
  6. Aug 7, 2009 at 9:58 AM
    #6
    thekidcatcher

    thekidcatcher Well-Known Member

    Joined:
    Apr 4, 2009
    Member:
    #15573
    Messages:
    2,800
    Gender:
    Male
    San antonio, tx
    Vehicle:
    05 TRD offroad SR5
    Toy-tec lift, Helo rims, BFG KM2 285/75/R16, Warn M8000 w/ Warn wirless remote, CB, PA, 12in sub with alpine amp, All-Pro offroad front/rear/rocksliders, highlift jack, JBA headers, midpipe, exhaust, Safari Snorkel, Siren, Bilstein 5100 in front with OME 886, UWS toolbox, Dual Battery, Warn Air compressor, Total Chaos UCA's, 5150's bilstein in the rear, URD MAF sensor, u bolt flip kit, diff armor, touchscreen cd player hooked up to front and rear cameras, dvd anytime mod, in dash inverter, Cobra CB
    Check out 12voltguy.com he has a really good dual battety kit. :)
     
  7. Aug 7, 2009 at 10:04 AM
    #7
    OddSmurf1492

    OddSmurf1492 [OP] Member

    Joined:
    Jun 18, 2009
    Member:
    #18641
    Messages:
    13
    Gender:
    Male
    MN
    Vehicle:
    99 2.4 5spd base
    What amperage is the alternator on the 2.4?
     
  8. Aug 7, 2009 at 11:07 AM
    #8
    johnecon2001

    johnecon2001 Well-Known Member

    Joined:
    Apr 26, 2009
    Member:
    #16456
    Messages:
    1,019
    Gender:
    Male
    Phoenix, AZ
    Vehicle:
    2005 TRD Sport 4x4 Access Cab
    Downey front skid, Trail Gear U-Bolt flip, Toytec AAL, Total Chaos UCA's, Bilstein 5100's x4 + Eibach adjustable coils, Doug Thorley Long Tube Headers, Custom Rear bumper, TRD OffRoad front tow hook, TRD Trail Team wheels, Federal Couragia M/T 265's, ARB rear locker + on board air (CKMA12), TRD shift knob, Alpine W205, TRD seat covers, Tom Woods 1 Piece drive shaft, Powermaster D2700, Stubbs HD-SKO Sliders.
    Gotta love finding accessories for that stuff :p
     
  9. Aug 7, 2009 at 12:04 PM
    #9
    PrezidentRedz

    PrezidentRedz Uncivilized Creations Prez

    Joined:
    Nov 17, 2008
    Member:
    #10820
    Messages:
    3,687
    Gender:
    Male
    First Name:
    Redz
    Owings, MD
    Vehicle:
    00 Taco 4x4 Xtra Cab, Locked and Lifted.
    Custom Everything! WHAT º¿º
  10. Aug 1, 2012 at 8:26 PM
    #10
    RDtres

    RDtres Well-Known Member

    Joined:
    May 20, 2012
    Member:
    #79224
    Messages:
    168
    Gender:
    Male
    Albuquerque
    Vehicle:
    2012 Tacoma DC LB
    Great Find man! This is the most affordable setup I've seen :D
     
  11. Aug 1, 2012 at 8:32 PM
    #11
    Blackdawg

    Blackdawg Dr. Frankenstein

    Joined:
    Dec 31, 2010
    Member:
    #48500
    Messages:
    57,110
    Gender:
    Male
    First Name:
    Monte
    Wyoming/St. Louis
    Vehicle:
    96.5 FrankenTaco & 03 Stock dbl cab
    BFG KM2 33x12.5 tires, Wheelers Type B rims, Allpro 1.5'' Wheel spacers w/extended thread lug nuts 2 Alpine 10'' Type Xs 2 Kicker 6X9s 4 Sony 5 1/4s Pioneer 4100 HU Sway bar removed 4 Hella 500 HIDs Frankenstein Leaf packs 1'' lift shackles Eibach coils 5100s front 10'' 5150s rear BAMF BPV bracket Deckplate mod Elite Front bumper Magnaflow 14'' muffler Elite Off Road Rear bumper with Tire gate with jerry can and fold down table, BAMF sliders, Custom Homemade Bed, rack/roof rack, CVT Mt. Shasta Roof Top Tent, 20lb CO2 tank, BAMF diff skid custom front skid, GM CS144 140 amp alternator Blitzpro 21s HAWK side LEDs Blitzpro Custom made side mirror lights, LightForce 240 Blitz llights, Piaa 510 ION fogs, XRC8 Winch w/in cab controls,
  12. Aug 3, 2012 at 6:25 AM
    #12
    Hillingdoner

    Hillingdoner Well-Known Member

    Joined:
    Jan 9, 2012
    Member:
    #70273
    Messages:
    458
    Gender:
    Male
    Rio Rancho, NM
    Vehicle:
    95 LX xtracab 3.4L 4x4 5spd
    140 amp Cadillac alternator, Audio system in progress, 4Runner map light mirror conversion, foot well lamp addition, buckets and console from 99 Tacoma regular cab, big three, tint
    Agree, isolator the way to go. That way you can run the extras off the secondary battery and not have to worry that you've run your starting battery flat.

    Your stock alternator should be 70 amp on the 2.4 from what I can see.
     
  13. Aug 3, 2012 at 6:41 AM
    #13
    Bryan139

    Bryan139 I have a spectacular aura

    Joined:
    Aug 25, 2008
    Member:
    #8746
    Messages:
    546
    Gender:
    Male
    NJ
    Vehicle:
    '09 Sport
    I cut some wires here. Added some wires there.
To Top