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fluctuation in rpm with turn signal on? WTF?

Discussion in '80-Series Tech' started by concretejungle, Jul 28, 2005.

  1. concretejungle

    concretejungle SILVER Star

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    Never had this happen before, but yesterday with the AC on i was stopped at a stop light turning left. Had the left blinker on and noticed the rpms would ramp up and drop down (very slightly, not even a ticks worth) in sink with the turn signal. Then after a minute it stopped. Maybe alternator going bad?
     
  2. Biff

    Biff

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    sorry to revive an old thread, but did you ever figure out what this problem was-I've been getting the same problem, but not just with the turn signals its with everything electrical on my rig-windows, lights, door locks, everytime I operate something I get a upward tick on my rpms, as well as an downward tick on my alt. gauge.
     
  3. TX_TLC

    TX_TLC

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    I contributed to the same topic thread a lot longer back. Still have not answers but another idea. I can see the A/C causing the tach to move...but with the turn signals...I wonder it if is just electrical and has nothing to really do with the engine being under more load.
     
  4. Biff

    Biff

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    I think it is electrical now that I think about it, because these symptoms started when I installed my yellow top.
     
  5. TX_TLC

    TX_TLC

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    Hmm very interesting. What battery did you have before?
     
  6. Biff

    Biff

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    A duralast, the PO had it for a few years- I killed it when I turned on my newly installed Lightforces. I still haven't tried changing the batteries to see if it is the yellow top.
     
  7. cruiser ken

    cruiser ken

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    Mine does it without the a/c on, no optima. Do you have an arb or rear tire carrier bumper that has extra turn signals? My arb front and tjm rear bumpers have turn signals in them. I thought it might be from having the brake on, and 4 turn signals going.
     
  8. concretejungle

    concretejungle SILVER Star

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    Mine has stopped doing this since i posted this thread. It only did it a few times. I have no idea.
     
  9. turbocruiser

    turbocruiser SILVER Star

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    I have had this symptom for some time now through two types of batts. I do not think this is really related to the batt at all. I think it is just a super sensitive gauge showing some real fluctuations in voltages as voltage drawing devices such as blinkers, wipers, etc oscillate. I will post the thread that I started some time ago and where Robbie and Raven offered some super advice. Since that time the problem has neither gotten worse or better. HTH.

    https://forum.ih8mud.com/showthread.php?t=21667
     
  10. Biff

    Biff

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    Have an ARB with turn signals, thought it was that but after some test it wasn't.
     
  11. Biff

    Biff

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    Thats intersteing, I didn't have this problem until I changed bats. Another thing that happens is that every once in a while I blow the turn signal fuse.
     
  12. dfmorse

    dfmorse

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    Concrete;

    I would check the body grounds. Particularly the ground that comes off the stock battery set up; neg cable, has a short #10 lead to the left fender. See what they look like, clean them up and see what happens. I have found lots of corrosion on my '94 and I live in a dry climate.

    dfm

    ...
     
  13. nyk438

    nyk438

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    My battery gauge goes up and down when I have a turn signal on but thats about it. Try charging the battery.