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 hot, replaced, new Alternator hot

Discussion in 'Toyota Trucks & SUVs' started by johnbrown552000, Jul 17, 2011.

  1. Jul 17, 2011 at 4:34 PM
    #1
    johnbrown552000

    johnbrown552000 [OP] New Member

    Joined:
    Jul 17, 2011
    Member:
    #60047
    Messages:
    3
    Gender:
    Male
    Arizona
    Vehicle:
    99 Tacoma 4x4
    Any suggestions? I have a 99 Toyota Tacoma 4x4, 2.7. Alternator was running extrememly hot, replaced it even though it tested out ok. New one is still running hot.

    Also, emergency brake light stays on, horn blows the fuses, heater doesn't work, not sure if it is all connected to the problem.

    Any suggestions?
     
  2. Jul 17, 2011 at 4:41 PM
    #2
    Superx2

    Superx2 Well-Known Member

    Joined:
    Feb 20, 2011
    Member:
    #51552
    Messages:
    1,649
    Gender:
    Male
    First Name:
    Joey
    Iowa
    welcome to TW! sounds like a wiring problem. since when did they put a altinator temp gage in tacomas... must be a 1st generation thing.
     
  3. Jul 17, 2011 at 5:10 PM
    #3
    johnbrown552000

    johnbrown552000 [OP] New Member

    Joined:
    Jul 17, 2011
    Member:
    #60047
    Messages:
    3
    Gender:
    Male
    Arizona
    Vehicle:
    99 Tacoma 4x4
    No temp guage, just by touch. Trying to troubleshoot the wiring since I think it is all related to the same issues.
     
  4. Jul 17, 2011 at 5:40 PM
    #4
    wrmathis

    wrmathis Dark Lord of the Sith

    Joined:
    Sep 10, 2008
    Member:
    #9126
    Messages:
    6,842
    Gender:
    Male
    First Name:
    Ryan Mathis
    Lives: Fountain, Colorado/Home: Leesburg, GA
    Vehicle:
    2006 Tacoma TRD OR 4x4
    parts and stuff
    im pretty sure the alternator gets hot regardless. have u had ur brakes looked at lately? i know on my older toyota pickup, when the brakes needed replacing the emergency brake light would comeon and i had to mess with the emergency brake to make it go away. after replacing the brakes, i didnt have the problem anymore.

    the horn thing i dunno? check to see if the power wire is grounding out is all i can think of
     
  5. Jul 17, 2011 at 5:49 PM
    #5
    PAlittlematty

    PAlittlematty "the soulless ginger"

    Joined:
    Dec 6, 2010
    Member:
    #47260
    Messages:
    3,950
    Gender:
    Male
    First Name:
    Matt
    Beech Creek, PA
    Vehicle:
    Casper the friendly Taco
    OME Lift, 885 Coils, 13MM Top Spacer, Dakar Leafs, DSM UCAs, Homeroshi Flush Mount Grille, WeatherTech Digifit Mats, Bestop Super Top, Toyota Bed Extender, Clevice Receiver
    Puah in on the ebrake handle n see if the light goes out. I know a few guys that had 1st gens n that happened to them. The alternator gets hot regardless. Its creating electricity and its close to the engine. Dunno bout the horn or heater
     
  6. Jul 17, 2011 at 8:47 PM
    #6
    johnbrown552000

    johnbrown552000 [OP] New Member

    Joined:
    Jul 17, 2011
    Member:
    #60047
    Messages:
    3
    Gender:
    Male
    Arizona
    Vehicle:
    99 Tacoma 4x4
    Thank you all for the suggestions. We appreciate it. We are chasing wires.
     
  7. Jul 18, 2011 at 5:17 AM
    #7
    skytower

    skytower Well-Known Member

    Joined:
    Jun 7, 2010
    Member:
    #38505
    Messages:
    3,221
    Gender:
    Male
    First Name:
    Dave
    virginia
    Vehicle:
    08 Tacoma 4x4
    Hitch and wiring, aux back-up light, rear strobe lights, radio and underseat sub.
    Either there is a short on the horn circuit, or it's going bad. Check for voltage at the heater. If none on low, check the blower resistor. If none on high, swap the blower relay.
    If the parking brake is not seated or the switch is broke, the light will stay on.

    Are you running amps, running lights, etc? The harder the alternator works, the hotter it will get. Be sure you are not overloading it. Borrow an amprobe and run everything with the probe on it to see what you're drawing.
     
  8. Aug 11, 2014 at 4:49 PM
    #8
    MattFL

    MattFL Well-Known Member

    Joined:
    Aug 4, 2012
    Member:
    #84071
    Messages:
    47
    Gender:
    Male
    S. Florida
    Vehicle:
    1999 Tacoma V6 4x4 TRD Extended cab
    Did you ever get the hot alternator issue sorted?

    I'm having the same problem, suddenly. 1999 Tacoma V6 3.4L. Long story short; My truck is stone cold, I start the motor and 30 seconds later the alternator is crazy hot and I can smell it burning. I can also hear the belt straining. I unplug the alternator control wires and the problem goes away, however this disables the alternator.

    I'm thinking it's an alternator problem, but I don't know if there's any external voltage regulation and I would hate to replace the alternator only to find out the problem is something else. It's definitely a problem, not normal. I stopped driving when I smelled the burning.
     
  9. Aug 13, 2014 at 2:15 AM
    #9
    lunch box

    lunch box diesel mechanic

    Joined:
    Sep 9, 2012
    Member:
    #86553
    Messages:
    130
    Gender:
    Male
    Vehicle:
    2000 trd tacoma
    diff lock grey wire mod k&n77series cold air intake 2nd gen s/c water meth injection 7th injector urd 5100s lift all the way around add a leaf new excedy clutch and rear main seal scan guage 2 wet okole covers.bazooka tube.& some minor body stuff.TRD supercharger,URD 7th injector kit
    did you know a bad battery can cause your alt to produce full field current all the time,which will ruin a alternator, also battery connections and battery failure can cause all the problems you are talking about, Id really clean all battery terminals and connections and check your battery. there is also a amp draw test for your alternator you can do and battery tests. thats where I would start.
     
  10. Aug 13, 2014 at 3:28 AM
    #10
    Shadetree

    Shadetree Well-Known Member

    Joined:
    Dec 22, 2010
    Member:
    #48053
    Messages:
    534
    Gender:
    Male
    First Name:
    BiLL
    Bozeman, Montana
    Vehicle:
    2011 Access Cab 4x2
    Locking Tailgate & Gas Cap and extra bed D-rings
    2X
     
  11. Aug 13, 2014 at 4:39 AM
    #11
    MattFL

    MattFL Well-Known Member

    Joined:
    Aug 4, 2012
    Member:
    #84071
    Messages:
    47
    Gender:
    Male
    S. Florida
    Vehicle:
    1999 Tacoma V6 4x4 TRD Extended cab
    My battery seems fine, it charged right up to full charge with my automatic 6A charger. It also holds charge fine and allowed me to drive the 30 minutes home from work without an alternator. ;) My new alternator will hopefully be in today and I'll post back with the result.
     
  12. Aug 13, 2014 at 5:58 PM
    #12
    MattFL

    MattFL Well-Known Member

    Joined:
    Aug 4, 2012
    Member:
    #84071
    Messages:
    47
    Gender:
    Male
    S. Florida
    Vehicle:
    1999 Tacoma V6 4x4 TRD Extended cab
    I put the new alternator in this morning and that seems to have done the trick, things are back to normal. I guess something went bad inside it.
     
  13. Aug 14, 2014 at 9:22 AM
    #13
    Shadetree

    Shadetree Well-Known Member

    Joined:
    Dec 22, 2010
    Member:
    #48053
    Messages:
    534
    Gender:
    Male
    First Name:
    BiLL
    Bozeman, Montana
    Vehicle:
    2011 Access Cab 4x2
    Locking Tailgate & Gas Cap and extra bed D-rings
    Good! Probably a shorted diode.
     
To Top