How I converted 2 wire turn signals to 3 wire (with pictures)
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  1. #1
    Senior Member Deadrubberboy's Avatar
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    Lightbulb How I converted 2 wire turn signals to 3 wire (with pictures)

    I wanted to replace my stock black front signals with chrome ones. I ordered a set from ebay that stated they were compatible with my Cm400a and they looked identical in the pictures (except chrome instead of black). When they arrived I discovered they only had 2 wires and were single filament bulbs. Instead of returning them I decided to try my luck at swapping the guts, and it was actually really easy.

    Since the housing were the same I just took off the lens cover, and then removed the single screw in each holding the sockets in. Pull the wires through the hole they're routed through swap them and put it back the way you found it. The only thing I had to add was a washer as the screw that held the socket in the new housing was too small for the large hole in the old "square washer" (different sized screws). I also added a ground wire under the washer so I don't have to rely on the bar itself to be grounded inside the headlight housing. I'll run the new ground wire to any of the dark green grounds inside the housing.

    I used a 9v to test both the running and signal filaments before actually re-attaching to the bike. Pretty simple, and hopefully the pictures explain better than my words.
    How I converted 2 wire turn signals to 3 wire (with pictures)-dual-filament.jpg
    Original housing showing both filament "nipples" on bulb and socket

    How I converted 2 wire turn signals to 3 wire (with pictures)-photo-dec-17-11-39-33-am.jpg
    New single filament bulb and socket - not able to do both running and turn signal lights (even though the item description said it was a direct replacement)

    How I converted 2 wire turn signals to 3 wire (with pictures)-photo-dec-17-11-37-30-am.jpg
    Old housing with "Square washer"

    How I converted 2 wire turn signals to 3 wire (with pictures)-photo-dec-17-12-51-33-pm.jpg
    Original socket in new housing. New small washer with ground cable underneath.

    How I converted 2 wire turn signals to 3 wire (with pictures)-photo-dec-17-11-35-31-am.jpg
    Final product!
    Last edited by Deadrubberboy; 12-18-2014 at 11:26 AM. Reason: post wrong pic of dual filament bulb first time.

  2. #2
    Super Moderator longdistancerider's Avatar
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    Good deal, nice write up. Might add a picture or 2 of the dual filament socket and bulb end like picture #2 for comparison sake.

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  3. #3
    Senior Member Deadrubberboy's Avatar
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    Thanks! I used wrong pic for first one. Caption tells me I meant to use the dual filament pic. Thanks for pointing it out the mistake. - I'll edit now.
    Last edited by Deadrubberboy; 12-18-2014 at 11:28 AM.

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  5. #4
    Member Mantree's Avatar
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    Nice move on adding the ground wire

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