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

Alternator only pushing 10.4 volts....

Discussion in '1st Gen. Tacomas' started by 97yota4wd, Nov 4, 2011.

  1. Nov 4, 2011 at 10:24 PM
    #1
    97yota4wd

    97yota4wd [OP] Well-Known Member

    Joined:
    Aug 26, 2010
    Member:
    #42280
    Messages:
    13,025
    Gender:
    Male
    First Name:
    Eric
    Mesa, AZ
    Vehicle:
    alot of metal, small engine, decent travel.
    caged, camburg long travel, 50t leafpack (soon to be installed) light rack over cab, 5pt harnesses etc
    okay so i was out at Glamis California and i was driving around in the dunes... my truck bogs down. there's a brand new 160 amp high output alternator (re manufactured) in there. so i throw in another battery just to get me back to camp.

    so i pull out a ohmmeter and test the volts coming out of the alternator. it says about 10.4 volts. now i know this isnt right, because its supposed to push out 14.4 volts give or take .5.

    so i call the place where i got my 160 amp high output alternator and they send me out another one.

    so i put this one in and i take it down to o Reilly and they say its still pushing 10.4 volts.... the new one i just got!! so i called my friend and he said sometimes with the high amperage alternators the volts will be low at idle but higher when not at idle. but the store is closed now and i don't have my ohmmeter handy..... couldn't be a fuse since its still somewhat working.... or ground cause its somewhat working... any ideas??

    my truck hasn't bogged down yet with this alternator but i have only driven it 20 miles.

    thanks in advance
     
  2. Nov 4, 2011 at 10:32 PM
    #2
    97yota4wd

    97yota4wd [OP] Well-Known Member

    Joined:
    Aug 26, 2010
    Member:
    #42280
    Messages:
    13,025
    Gender:
    Male
    First Name:
    Eric
    Mesa, AZ
    Vehicle:
    alot of metal, small engine, decent travel.
    caged, camburg long travel, 50t leafpack (soon to be installed) light rack over cab, 5pt harnesses etc
    and i want being very nice to my truck that weekend either if that matters
     
  3. Nov 4, 2011 at 10:49 PM
    #3
    wolfgang123

    wolfgang123 Well-Known Member

    Joined:
    Jul 7, 2009
    Member:
    #19369
    Messages:
    1,360
    Gender:
    Male
    First Name:
    Skyler
    Statesboro, GA
    Vehicle:
    1997 TACOMA - 4x4
    i have one of those...its full on at like 750rpm for me
     
  4. Nov 4, 2011 at 10:55 PM
    #4
    97yota4wd

    97yota4wd [OP] Well-Known Member

    Joined:
    Aug 26, 2010
    Member:
    #42280
    Messages:
    13,025
    Gender:
    Male
    First Name:
    Eric
    Mesa, AZ
    Vehicle:
    alot of metal, small engine, decent travel.
    caged, camburg long travel, 50t leafpack (soon to be installed) light rack over cab, 5pt harnesses etc
    dang okay thanks.

    any idea on what it could be??
     
  5. Nov 4, 2011 at 11:39 PM
    #5
    97yota4wd

    97yota4wd [OP] Well-Known Member

    Joined:
    Aug 26, 2010
    Member:
    #42280
    Messages:
    13,025
    Gender:
    Male
    First Name:
    Eric
    Mesa, AZ
    Vehicle:
    alot of metal, small engine, decent travel.
    caged, camburg long travel, 50t leafpack (soon to be installed) light rack over cab, 5pt harnesses etc
    its not my wiring either cause we just used a ohmmeter and bypassed all the wiring (straight from alternator to the negative) and its still putting out under 11 volts.

    i went through my stock one, a remanufactured one, and a brand new one. so it cant be the alternator its self...
     
  6. Nov 4, 2011 at 11:41 PM
    #6
    97yota4wd

    97yota4wd [OP] Well-Known Member

    Joined:
    Aug 26, 2010
    Member:
    #42280
    Messages:
    13,025
    Gender:
    Male
    First Name:
    Eric
    Mesa, AZ
    Vehicle:
    alot of metal, small engine, decent travel.
    caged, camburg long travel, 50t leafpack (soon to be installed) light rack over cab, 5pt harnesses etc
    how did you test it?
     
  7. Nov 5, 2011 at 1:49 AM
    #7
    97yota4wd

    97yota4wd [OP] Well-Known Member

    Joined:
    Aug 26, 2010
    Member:
    #42280
    Messages:
    13,025
    Gender:
    Male
    First Name:
    Eric
    Mesa, AZ
    Vehicle:
    alot of metal, small engine, decent travel.
    caged, camburg long travel, 50t leafpack (soon to be installed) light rack over cab, 5pt harnesses etc
    just got done walking home in the pouring rain. only a mile though:D

    dam alternator!!
     
  8. Nov 5, 2011 at 3:06 AM
    #8
    84Hilux

    84Hilux Well-Known Member

    Joined:
    Jul 6, 2010
    Member:
    #39877
    Messages:
    544
    Gender:
    Male
    First Name:
    Gary
    Vancouver, Canada
    Vehicle:
    09 SR5 Access Cab V6 4X4
    Stock Fog Lights, Camera Mirror, Arrow Canopy, Lighted 4x4switch, Weathertech Mats (Black), Wet Okoles- Black/Charcoal, Alpine CDA117 Headunit/ Alpine PDX4150 Amp/Alpine PDX M6 Amp/ Hybrid Legatia SE Components/ JL 10W6V2 Subwoofer/ Prototype MR Marv Sub Enclosure
    No excitation current at the field wire?
     
  9. Nov 5, 2011 at 7:52 AM
    #9
    isu2014

    isu2014 RAT Products

    Joined:
    Apr 12, 2010
    Member:
    #35140
    Messages:
    12,411
    Gender:
    Male
    First Name:
    Ryan
    Farmington, MN
    Vehicle:
    01 SUPERCHARGED TRD OR MANUAL 4x4 V6
    View the build. Too much to list.
    How do you have it wired? What gauge wires did you run? Big 3?
     
  10. Nov 5, 2011 at 9:50 AM
    #10
    97yota4wd

    97yota4wd [OP] Well-Known Member

    Joined:
    Aug 26, 2010
    Member:
    #42280
    Messages:
    13,025
    Gender:
    Male
    First Name:
    Eric
    Mesa, AZ
    Vehicle:
    alot of metal, small engine, decent travel.
    caged, camburg long travel, 50t leafpack (soon to be installed) light rack over cab, 5pt harnesses etc
    when i hook up a test light it lights up, i dont have an ohmmeter at the moment....


    im running all the stock stuff. i was tired last night when i typed this my story was wrong. my stock alternator stopped working, put in the high amp one and it still wasnt working (i didnt even drive with the high amp one) now i have this new one.

    so what ever happened happened when the stock alternator was in it.

    just went to o reillys and they tested the second alternator (1st high amp one) and its pushing 14.7 volts, when on the truck it only pushed 10.4 volts. even with the wires disconnected testing it directly form the alternator to the negative on the battery it still pushed the same. and when your alternator works you should be able to pull the positive off of the battery and it should stil run, it doesnt.
     
  11. Nov 5, 2011 at 10:15 AM
    #11
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Thor

    Joined:
    May 8, 2008
    Member:
    #6497
    Messages:
    103,772
    Gender:
    Male
    First Name:
    FlimFlubberJAM
    Tenoe, AZ
    Vehicle:
    2013 Rubicon Unlimited,
    4.10 gears, sliders, and lots of buttons.
    Sounds like you have a bad ground some place.
     
  12. Nov 5, 2011 at 12:09 PM
    #12
    isu2014

    isu2014 RAT Products

    Joined:
    Apr 12, 2010
    Member:
    #35140
    Messages:
    12,411
    Gender:
    Male
    First Name:
    Ryan
    Farmington, MN
    Vehicle:
    01 SUPERCHARGED TRD OR MANUAL 4x4 V6
    View the build. Too much to list.
    With your high amp alternator you definitely need to upgrade the wiring from the alternator to the battery and I would suggest the big 3. Those wires will burn up real quick if you drive with that high amp. As chris4x4 said there is a grounding issue and rewiring will allow you to get a fresh clean ground.
     
  13. Nov 5, 2011 at 2:37 PM
    #13
    97yota4wd

    97yota4wd [OP] Well-Known Member

    Joined:
    Aug 26, 2010
    Member:
    #42280
    Messages:
    13,025
    Gender:
    Male
    First Name:
    Eric
    Mesa, AZ
    Vehicle:
    alot of metal, small engine, decent travel.
    caged, camburg long travel, 50t leafpack (soon to be installed) light rack over cab, 5pt harnesses etc
    FFFFFFFFFFFFFFFFFFFFFFUUUUUUUUUUUUUUUUUUUUUU


    okay so i checked my 80 amp alternator fuse. its good right? then i check all my fuses inside of my truck and there was a 10 amp fuse blown that doesnt let my dash work. replaced that baby and now im at 14.5 volts!!!!

    ill be upgrading my wiring also
     
  14. Nov 6, 2011 at 9:50 AM
    #14
    97yota4wd

    97yota4wd [OP] Well-Known Member

    Joined:
    Aug 26, 2010
    Member:
    #42280
    Messages:
    13,025
    Gender:
    Male
    First Name:
    Eric
    Mesa, AZ
    Vehicle:
    alot of metal, small engine, decent travel.
    caged, camburg long travel, 50t leafpack (soon to be installed) light rack over cab, 5pt harnesses etc
    i hate wiring. i went through about 20 fuses last night lol
     
  15. Nov 6, 2011 at 9:58 AM
    #15
    TacoMX

    TacoMX TW's Official anti body-lift pundit

    Joined:
    Aug 24, 2011
    Member:
    #62240
    Messages:
    4,833
    Gender:
    Male
    First Name:
    Jonathan
    Deltona, Florida
    Vehicle:
    '13 Tacoma TRD Sport DCLB 4x4
    stock.....for now...
    im right there with you. I SUCK at wiring and troubleshooting electronics....effing nightmare.

    My dad worked for 15 years as an aerospace electronics tech and troubleshooter....guess it just never rubbed off on me :D
     
To Top