Page 1 of 2 12 LastLast
Results 1 to 15 of 29

Thread: Dash warning lights

  1. #1
    '96 BPU TT Club Member Mk4Gaz's Avatar
    Join Date
    Jul 2013
    Location
    England - Essex
    Posts
    3,146
    Feedback
    14 (100%)

    Dash warning lights

    Hi guys, bit of a new problem here, and unsure what it is ?

    I was out in the car last week, and the following dash lights started randomly turning on and off, but all together.

    cat overheat
    red battery
    rear light warning
    yellow oil can

    I noticed my volt gauge showing only around 13v, so suspected a charging system fault. Anywho, i've replaced the alternator today with yet another new one (I had a print out with it to show it's test results), and although my volt gauge is now showing the correct 14.4v with the engine running, the lights are still on but permanently now ?

    I've checked error codes, and it's clear. Checked the back lights and they're all good. I know it's charging, pretty sure the oil pressure is good as it runs sweet, and the light doesn't go out if I raise the revs, and I don't have a cat anymore !

    Any ideas what the problem could be - far short of a dry joint somewhere, i'm fresh out of ideas !

  2. #2
    I can post! Club Member ghostbuster's Avatar
    Join Date
    Nov 2010
    Location
    England - Devon
    Posts
    62
    Feedback
    0
    Have you had the dash out recently, sometimes the plugs on the left and/or right top do not connect properly.

    Mind you I did have a similar problem when my alternator was slowly conking out with a diode fault. Maybe worth checking the alt on a test bench (even though its a new one).

  3. #3
    I can post! MEMBERSHIP EXPIRED
    Join Date
    Sep 2009
    Location
    England - Essex
    Posts
    79
    Feedback
    0
    I had this when my alternator went where the warning lights didn't go off after the alternator was replaced, had the same warning lights.

    After spending ages trying to figure out what the problem we started checking the fuses and one had blown, replaced that and everything was fine. I can't remember which fuse it was though but might be worth having a quick check of them, it was one of the small fuses.

  4. #4
    '96 BPU TT Club Member Mk4Gaz's Avatar
    Join Date
    Jul 2013
    Location
    England - Essex
    Posts
    3,146
    Feedback
    14 (100%)
    Thanks chaps, I'll have a go with the fuses tonight.

    I've not had the dash trims out for a while, but, because the warning lights are either side, it would be odd for both plugs to not be in correctly - or have a dry joint somewhere?

    Odd that it was fine before I tidied the engine bay up, then after refitting everything, my alternator packed up. Replaced it with a new one only a few weeks ago, and all seemed fine. Then randomly these lights started flicking on and off, with my voltage gauge flicking between 12.9 and 15.7 with the engine running, so I limped it home, replaced the alternator yet again, and although it now seems to be charging properly, the lights are now on permanently!

    Bloody cars!

  5. #5
    I'm part of the furniture Club Member Ian C's Avatar
    Join Date
    May 2001
    Location
    England - East Anglia
    Posts
    15,114
    Feedback
    13 (100%)
    It could be an earth fault. Are any of the lights dimmer than they should be? Check the earth strap under the intake manifold, I had the bolt come out of mine once and the car wouldn't start and those lights you mention lit up with varying brightness.
    I love my job. It pays for my Supra.

  6. #6
    '96 BPU TT Club Member Mk4Gaz's Avatar
    Join Date
    Jul 2013
    Location
    England - Essex
    Posts
    3,146
    Feedback
    14 (100%)
    Thanks ian, interesting as another member has suggested that, it's plausible as I've recently had the inlet manifold off. The lights are all full brightness though. I'll check that tonight too

  7. #7
    '96 BPU TT Club Member Mk4Gaz's Avatar
    Join Date
    Jul 2013
    Location
    England - Essex
    Posts
    3,146
    Feedback
    14 (100%)
    Well, I've checked all fuses, and all look good. Checked the inlet manifold earth, and that's secure and tight, checked the battery to chassis earth, and that's also good?

    Any other ideas folks, I'm worried about using the car in case something bad is going on !

  8. #8
    Hardcore medallion man Club Member markssupra's Avatar
    Join Date
    Nov 2005
    Location
    England - Essex
    Posts
    3,017
    Feedback
    11 (100%)
    I had a dry solder joint on the right hand warning lights module. A quick go over with the soldering iron sorted the problem. Other than what else has been suggested, I'm not sure what else it could be mate.

    Maybe try disconnecting the battery to reset the ECU, I have the Toyota manuals if you need to check anything.
    Last edited by markssupra; 25-02-14 at 11:21.
    My HKS GT 2835 Big Twins AeroTop project
    "ere, do you reckon we could gatecrash that spit roast over there!"
    quote Lee S, JAE 2008

    Precision Industrial Cutting Tools for Metals, Metal Matrix Composites, Composite materials and Wood
    GZ TT Aerotop BPU. 313 RWHP. Engine Advantages 30/03/08, soon to be HKS Big twins
    GZ TT Aero R.I.P. 2004

    Chair cover hire for weddings or occasions


  9. #9
    '96 BPU TT Club Member Mk4Gaz's Avatar
    Join Date
    Jul 2013
    Location
    England - Essex
    Posts
    3,146
    Feedback
    14 (100%)
    Right, just been out for a drive, and something definitely isn't right.

    On first start, it was sitting happily at 14.4v. Soon after leaving home, it dropped to around 14.1 - 14.2, headlights on and heaters on low. I was out for around 15 minutes, and pulled into a garage. Turned the heaters to max, and voltage steadily dropped from 14.1v down to 12.9v within a few seconds.
    Flicked the heaters off, voltage climbed again.
    Carried on driving, and a few minutes later, the voltage was up to 17v!
    It hovered between 16v and 17v for a few seconds, then dropped back down to around 14v. Incidentally, at around 15v all the warning lights went out, then came back on either side of that voltage.
    Got it home, was out for around 25 minutes in total, and once on my drive, Flicked the heaters back to max, and it steadily dropped to 12.3v before I switched the heaters back off.
    Also, I noticed that if I put my foot down to accelerate, then voltage would also drop.

    Does this sound like yet another faulty alternator, the wrong type of alternator, or is there anything else that could be causing this - to do with the car itself?

  10. #10
    '96 BPU TT Club Member Mk4Gaz's Avatar
    Join Date
    Jul 2013
    Location
    England - Essex
    Posts
    3,146
    Feedback
    14 (100%)
    Should also mention that the warning lights were on the whole time, except for the brief moment when it touched around 15v. And, the master warning light in the middle is also illuminated - didn't mention that before!

  11. #11
    Hardcore medallion man Club Member markssupra's Avatar
    Join Date
    Nov 2005
    Location
    England - Essex
    Posts
    3,017
    Feedback
    11 (100%)
    I would get that alternator checked, I had a similar problem on another car a long time ago where all the warning lights came on, headlights, dash lights dimmed down and engine was losing power. Iirc, that was the alternator causing the problem.
    My HKS GT 2835 Big Twins AeroTop project
    "ere, do you reckon we could gatecrash that spit roast over there!"
    quote Lee S, JAE 2008

    Precision Industrial Cutting Tools for Metals, Metal Matrix Composites, Composite materials and Wood
    GZ TT Aerotop BPU. 313 RWHP. Engine Advantages 30/03/08, soon to be HKS Big twins
    GZ TT Aero R.I.P. 2004

    Chair cover hire for weddings or occasions


  12. #12
    '96 BPU TT Club Member Mk4Gaz's Avatar
    Join Date
    Jul 2013
    Location
    England - Essex
    Posts
    3,146
    Feedback
    14 (100%)
    I think you're right mark, odd that two new alternators are giving me the exact same issue?
    I've compared my original alternator (oem) with one of the new ones this evening, and the old one is physically bigger, and has a slightly bigger pulley on it. I know the belt isn't slipping, and there is plenty of tension, but I'm wondering if I've been supplied two incorrect alternators?
    Are the na ones different, apart from the amperage? Would an na one work on a tt?

  13. #13
    I can post! Club Member ghostbuster's Avatar
    Join Date
    Nov 2010
    Location
    England - Devon
    Posts
    62
    Feedback
    0
    It really does sound like a duff alt AND the wrong one.

  14. #14
    Hardcore medallion man Club Member markssupra's Avatar
    Join Date
    Nov 2005
    Location
    England - Essex
    Posts
    3,017
    Feedback
    11 (100%)
    I think the NA and TT are different, not 100% sure though. Something is causing the voltage fluctuations, that sounds like the regulator to me.
    My HKS GT 2835 Big Twins AeroTop project
    "ere, do you reckon we could gatecrash that spit roast over there!"
    quote Lee S, JAE 2008

    Precision Industrial Cutting Tools for Metals, Metal Matrix Composites, Composite materials and Wood
    GZ TT Aerotop BPU. 313 RWHP. Engine Advantages 30/03/08, soon to be HKS Big twins
    GZ TT Aero R.I.P. 2004

    Chair cover hire for weddings or occasions


  15. #15
    Chris Bailey's minder Club Member jcbt's Avatar
    Join Date
    Feb 2012
    Location
    England - Essex
    Posts
    1,637
    Feedback
    7 (100%)
    Gary
    I think I have an old TT alternator at home which your welcome to try in place of yours. It was changed out due to bearing noise but other than that it worked fine.
    SRD 850S - 93 J-Spec Precision 6466 Gen 2 single - Built by SRD
    850 HP and 641 ft/lb torque and yes it's an auto

Page 1 of 2 12 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •