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RWD - flickering red arrow on lower right hand side of instrument panel

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flickering red arrow on lower right hand side of instrument panel 200 1989

First of all, thank to Machine Man (Phil), Michael Yount, Art Bernstein, Blindboy, and Aleekat for help in resolving a no start issue after replacing a starter and solenoid on my 89 240D automatic. Following your various bits of advice and guidance, I now have it starting and running normally. I had taken apart the neutral safety switch and cleaned the contacts as well as check and clean contacts throughout the ignition system. I am left with one residual issue, a flickering red/orange upward-pointing arrow light that appears at the right hand bottom of the instrument panel. It intensifies with higher rpms and reduces when you let the gas off. It seems to emulate the firing of the ignition system. Any advice? And thank you all again! Deniv, Tucson AZ





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    flickering red arrow on lower right hand side of instrument panel 200 1989

    One possible culprit for this is that the wrong wire is connected to the overdrive indicator on your instrument cluster. If my memory serves me well, the overdrive indicator (upshift indicator for manual transmissions) has a separate wire connected on the back of the instrument cluster. If you pull the cluster, it is connected to the lower-right side of as you face the cluster. If the red/white wire is connected there, it is wrong. The red/white wire should not be connected to anything if you don't have a tachometer. If the red/white wire is connected here, it would give you the symptoms you describe.

    I forget the color of the correct wire (yellow?). Perhaps someone on the board can specify.





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      flickering red arrow on lower right hand side of instrument panel 200 1989

      Sounds exactly right to me. Almost sounds like the voice of experience?

      The correct wire on that corner tab is yellow/red, and the tab is smaller than the usual, 3/16" vs. 1/4".

      Good call!
      --
      Art Benstein near Baltimore

      Notes on the Temp Faker - Or That Temp Comp Board





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        flickering red arrow on lower right hand side of instrument panel 200 1989

        Hi there gentlemen,

        Sounds interesting enough to be a coil wire for a tachometer but I do not recall him saying that he ever had the dash cluster out?
        I do remember that he did some work on the shifter involving the neutral safety switch because he could not get enough power to the solenoid on the starter.

        I hope he posts back after the holiday and tells us where the flag was waving on the trouble spot!

        Phil





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          flickering red arrow on lower right hand side of instrument panel 200 1989

          Greetings, my old 240 is sitting in the back yard, starts right up but the arrow light continues to flicker. Thanks for all the reasoning, Phil. I will get back to diagnoses within the next couple of days. I never had the instrument cluster out except to change light bulbs but that was long ago. Undoubtedly the problem lies somewhere where I was fiddling with the safety switch, the shift selector or checking wires in the engine compartment and maybe interrupting a grounding connection. I thank you all again and will post some results after I try to apply the voltmeter in previously unexplored areas. denisv





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    flickering red arrow on lower right hand side of instrument panel 200 1989

    Hi Dennis,

    Thanks for buffing all of us up!
    Kindness will get you everywhere or at least down the road!

    Just looking over your car from afar!

    Glad to hear that you got the engine going!
    Hopefully, you have learned a little along the way.
    Can I say ...? I don't think you used some of the techniques of the voltmeter enough to show you its full capabilities.
    There are good things about using that jumper cable to bypass the problem as it to shows that good ole' common sense is still a live and well too!
    But there might be one lurking in the shadows!

    I think the up arrow is controlled by the ECU. It watches the RPM's of the engine a lot.
    You might still have some electrical issues going on in the way of low voltage, in the system to cause the flickering. 12.65V to or as high as 14.2V with the engine running is needed to keep all things happy.
    That's a lot of voltage difference for happiness and your car was down another whole volt. At 12.34V across the battery a battery is nearly dead. Tenths of a volt does matter on high current draws.

    I believe you could be having some grounding problems.
    The jumper cable with where where you had it, to start the car, will NOT resolve anything but the positive half side of that starter system.
    There are two separate positive circuits and this one was only to the power to the motor, not the whole cars system.
    The engine block is rubber mounted with that big current drawing apparatus hanging on its side!
    The ground cable is the other half, all by itself and sometimes you can swear, it might be bigger when you have corrosion issues.
    Did you verify the body grounds?

    When the voltages get even lower around 5 volts because computer components draw nearly nothing. The communication wiring is consequently downsized that translates into fragile in the big world.

    I think others have explained the arrow in that the ECU, thinks the overdrive switch is locking out the overdrive and it is advising you to shift up.
    It was said, the problem might be with the shifter mechanism area or the switches wiring.
    The flickering can be construed as half bright or half dim, just like with the solenoid, not getting enough power.
    Flipping a switch or the ECU rapidly doing the same thing can look like a damaged wire and Wiggling does the same. Damaged is a subjectively loose term, to how bad is it, yet!

    A resistance to current flow causes a voltage drop and therefore, the conditions above.
    The loss shows up as a lot "smaller" than supply voltage number because it "sees in effect" one side and then another side of the voltage being applied.
    Just like seeing a batteries voltage because the circuit is "working" (Corrosion) on becoming opened up. The voltmeter becomes across the potential as I said before.

    Since we cannot see electricity, the Voltmeter can be the next best tool in locating an area. The next tool are your eyes, of course!

    So learn to use a voltmeter please!
    As we all are into having bad eyesight, forward or maybe less backwards, if we learn, but with this stuff glasses help a lot! Just got to get either one fitted on correctly!

    Phil





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    flickering red arrow on lower right hand side of instrument panel 200 1989

    That is the overdrive indicator light for the transmission. It should be on or off but not flickering, look for a loose or shorting wire probably under the car or as the white solenoid wire enter the shifter assembly/

    Dan





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      flickering red arrow on lower right hand side of instrument panel 200 1989

      I believe the red arrow is actually and "economically" shift indicator that tells you shift to another gear, at least on my manual tranny that's what it is.
      --
      Post Back. That's whats makes this forum work.





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        flickering red arrow on lower right hand side of instrument panel 200 1989

        Yes manual's have the up shift indicator.

        Dan





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          flickering red arrow on lower right hand side of instrument panel 200 1989

          As I recall the owner manual has a reset procedure for a flickering shift light. If that doesnt work , could be a falling AMM.





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