Turn Signal Malfunction
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Thread: Turn Signal Malfunction

  1. #1
    Junior Member Fester's Avatar
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    Turn Signal Malfunction

    I got my 1990 TW a short while ago and I'm really enjoying wrenching on it. Greatly appreciate all the help you folks have provided to guide me along the way. Just got the carb and fuel petcock rebuilt and it runs great, now and there's no more leaking. I'm having an issue with my right turn signal: Left side blinks just fine and the light in the cluster gauge indicates that the signal is on. The right side blinks (both front and rear), but a bit slower than the left.. when the right side is engaged, the light in the cluster does not activate. Do you think this is a flasher unit? Or perhaps a bad bulb or ground? FYI, the PO installed aftermarket rear signals, but they look like they were installed quite professionally. Once I get this problem resolved and my parts come in to replace the shift shaft bearing the Mean T-Dub Machine will be in perfect working order.

  2. #2
    Senior Member SportsterDoc's Avatar
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    Most likely a wiring issue on the right side, probably from flasher to indicator.
    Have you reviewed a schematic?

    http://www.tw-parts.com/macbig2k1/do...ain_manual.pdf
    Last edited by SportsterDoc; 01-14-2019 at 07:27 PM.
    2014 Honda CB1100
    2018 Yamaha XT250
    2016 Moto Guzzi V7 II
    2017 Yamaha TW200
    2012 Triumph Bonneville
    2002 H-D Sportster 1200 Sport
    2003 H-D Sportster 883
    1976 Honda CB750F
    1975 Honda CB360
    1970 Yamaha CT1
    1972 Yamaha CT2
    1972 Yamaha AT2/CT2
    1970 Honda SL350
    1970 Honda CL350
    1967 Honda CL160
    1967 Honda CB160
    1962 Honda CA110

  3. #3
    Senior Member Fred's Avatar
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    The flash rate is a function of the circuit impedance. I agree right side circuit wiring has a problem. Corroded bulb socket or bullet connection could add resistance and slow down flash rate. I would inspect the front bulb & socket first.
    2003 TW200 "Betty Boop"
    2006 TW200 "Nibbler", a.k.a. “Mr.Gizmo"
    Hidden Content All Things Considered I’ld Rather Be Motorcycling

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  5. #4
    Junior Member Fester's Avatar
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    Thanks for the link.. not to gifted in the wiring department, though. Yes, I have removed the cover for the right front signal and inspected the bulb and connections; they look good. I'll keep fishing and see what I can find by tracing wires.

  6. #5
    Senior Member SportsterDoc's Avatar
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    I posted on an Ipad while multi-tasking and my answer was too brief.

    Fred has a better idea of first checking bulbs and sockets for corrosion or an almost broken wire.
    Lower resistance, as with LEDs, causes a more rapid flash with stock flasher.
    Higher resistance will indeed slow down the flash rate.

    Too difficult to see the schematic on an Ipad, so back on my laptop.
    If this schematic is appropriate for your model year:

    Red from battery goes to main switch
    Brown from main switch goes to flasher
    Brown/white from flasher goes to turn switch
    Left turn switch goes to chocolate
    Right turn switch goes to dark green, to front and rear turns and to right side of indicator lamp.

    If you swap bulbs from left to right or replace right bulbs with new, what are the results?
    Last edited by SportsterDoc; 01-14-2019 at 11:30 PM.
    2014 Honda CB1100
    2018 Yamaha XT250
    2016 Moto Guzzi V7 II
    2017 Yamaha TW200
    2012 Triumph Bonneville
    2002 H-D Sportster 1200 Sport
    2003 H-D Sportster 883
    1976 Honda CB750F
    1975 Honda CB360
    1970 Yamaha CT1
    1972 Yamaha CT2
    1972 Yamaha AT2/CT2
    1970 Honda SL350
    1970 Honda CL350
    1967 Honda CL160
    1967 Honda CB160
    1962 Honda CA110

  7. #6
    Senior Member Fred's Avatar
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    I may be a dinosaur but I still know what a pencil with an eraser tip is for: You put it in a drill and use the spinning eraser tip to clean deep bulb socket contacts.
    Seriously though a multimeter could measure circuit impedance but typically I just give everything the critical eye first.
    Old soft lead solder contacts on bulb bases can get deformed over time, vibration and milage but a little new solder can build their height back up to restore a good connection in those spring loaded bases. ( I live far enough from stores that fixing can be quicker than replacing).
    2003 TW200 "Betty Boop"
    2006 TW200 "Nibbler", a.k.a. “Mr.Gizmo"
    Hidden Content All Things Considered I’ld Rather Be Motorcycling

  8. #7
    Junior Member Fester's Avatar
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    Great idea. I will first clean contacts, then swap bulbs. If that doesn't work, I guess I'll have to start tracing wires.

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