Flasher That Works With Led Bulbs?

Discussion in 'Early CJ-5 and CJ-6 Tech' started by maurywhurt, Nov 30, 2017.

  1. Nov 30, 2017
    maurywhurt

    maurywhurt Sponsor Sponsor

    Western North...
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    I'm trying to find a flasher that will work with LED bulbs on my '67, which has a (repro) stock wiring harness from Walcks'
    that was recently installed. I bought these LED bulbs from Super Bright LEDs (two red and two amber):

    1157 LED Bulb - Dual Function 27 SMD LED Tower - BAY15D Retrofit | LED Brake Light, Turn Light and Tail Light Bulbs | LED Car Light Bulbs | Super Bright LEDs

    They work great in brake and parking light modes, so I know the polarity is correct, but they will not work in turn signal mode.

    The currently installed Novita flasher is electronic, and works fine with incandescent bulbs. It's supposed to work with LEDs bulbs as well, but in this case it doesn't. Has anyone found a flasher that works well with LEDs?
     
    Last edited: Dec 11, 2017
  2. Nov 30, 2017
    GeoffreyL

    GeoffreyL Active Member

    moorestown, nj
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    They might not draw enough load to make it flash, I think they make resistors or some kind of chip to add, can't remember what exactly.
     
  3. Nov 30, 2017
    45es

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  4. Nov 30, 2017
    maurywhurt

    maurywhurt Sponsor Sponsor

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    Last edited: Dec 11, 2017
  5. Dec 1, 2017
    Tom_Hartz

    Tom_Hartz Member

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    Look around on the web. Years ago I found information on modifing a two pole flasher. All you are doing is cutting a tracer on the circuit board with a razor blade. It is the one that sences a burned out bulb. I did it for my TJ and it worked great. However it has been so long I could not tell you where to cut.
     
  6. Dec 2, 2017
    liquids

    liquids 3rd Jeep

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  7. Dec 3, 2017
    supertrooper

    supertrooper Member

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    I got mine from summit racing since i was ordering other thing from them anyway. I have stock incandescent front signals and led tail lights and it works fine.
     
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  8. Dec 4, 2017
    Heimbig2

    Heimbig2 Member

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    One thing to watch is that an LED flasher has a plus and a minus side. Regular flashers it doesn't matter. If you get an LED flasher it should have a pair of jumper wires from flasher to fuse block or flasher stock location. If you install one and it won't flash try the jumpers to the opposite prongs. Works great.
     
  9. Dec 11, 2017
    Hellion

    Hellion Exciting New Member

    Eastern TN
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    That endorsement sounds good enough to me.

    What's the stock number and description of the one you bought? Got a link?
     
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  10. Dec 11, 2017
    maurywhurt

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    Wherever you buy from, before you purchase one, check and make sure whether your flasher has two pins or three.

    It turned out that mine had three. I bought this flasher, which has three pins plus a ground wire:

    Amazon.com: CEC Industries EF33RL Turn Signal Flasher Relay, LED Compatible, 3 + Ground Wire Prongs, 12 Volts: Automotive

    Evidently the ground wire is necessary due to the LED bulbs I used not creating sufficient load to operate a flasher that's ungrounded. It works fine, although for some reason the light in the Sparton turn signal switch housing flashes once after the turn signal lever has returned to center.
     
    Last edited: Dec 11, 2017
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  11. Dec 12, 2017 at 7:51 AM
    timgr

    timgr Jeepin' Nerd Sponsor

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    You need a ground wire because the new flasher has a timer circuit that opens and closes a transistor to flash the lights. This makes the flashing speed independent of the load, and the timer works with any kind of bulb. If you tried to use the lights connection as a ground, the timer circuit would lose its ground when the lights turn off and never turn on again. The old mechanical flasher has a bimetal strip that heats and cools from the current through it to make and break contact - no ground required.

    three-prong-flasher (420 x 199).jpg
     
    Last edited: Dec 12, 2017 at 8:04 AM
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  12. Dec 12, 2017 at 2:08 PM
    maurywhurt

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    Thanks for the thorough explanation complete with graphics, Tim!
     
  13. Dec 12, 2017 at 6:13 PM
    supertrooper

    supertrooper Member

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