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Just finishing up an RV-12iS installation.

Powered up the electrical, avionics -->  all is good.

Activated Lane A and B switch.  approx 3 seconds, Lane B extinguishes and Lane A goes to about half brilliance.

Checked the fault log from ECU . . . no faults logged

I've checked the wiring thru the ships harness up to the point that it interfaces to the Rotax harness -- checks good.

Thoughts?

Thanks!

Mike B

  • Re: Lane A status light partially illuminated

    by » 5 months ago


    Assuming you’re using LED it sounds like you don’t have a resistor on that bulb or it faulty or not connected properly.   

     

    edit: sorry I have the 915 installation manual page number.  Forgot which group I’m in, but same concept.   Just need to find in the 912 manual.  

    Diagram on page 12 of 76-00-00 in 915 installation manual


  • Re: Lane A status light partially illuminated

    by » 5 months ago


    Here’s diagram

    31717_2_98CFE4C7-5943-4D74-B9CD-7DC41B9097B9.png (You do not have access to download this file.)

  • Re: Lane A status light partially illuminated

    by » 5 months ago


    What Mike Said!  912is and 915is use the same circuit.

    That 1.5Kohm (1500 Ω) resistor is Not optional.
    The ECU assumes you are using an Incandescent lamp.
    In the OFF state, the ECU Lamp driver circuit still leaks a few Miliamps through the bulb.
    This will not be enough to light an incandescent lamp but it is plenty to light an LED Dimly.
    The side load resistor gives this leakage current a path around the LED instead of through it.

    The A and B Lamp circuits are both the same.  Just compare the two.


    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    Bill.Hertzel@Yahoo.com
    Clicking the "Thank You" is Always Appreciated.


    Thank you said by: Mike Buettgenbach

  • Re: Lane A status light partially illuminated

    by » 5 months ago


    Thx Bill

    Thinking along those same lines, I pulled the PC board out last night and inspected (best I could) with a magnifier and meter.  Nothing appears astray.

    what I want to do now is look at some voltages.  The circuit is really simple . . . but maybe it will tell me something.  I have a collection of D-sub connectors, I'll see what I can paste together for a break-out harness for troubleshooting.

     

    Thx again Bill

    Mike B


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