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Old 04-21-2012, 08:20 PM   #1
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LED signals won't flash

I put in my LED tail lights today and now the signals don't blink. I am pretty sure that it is an issue with the lower voltage requirements of the LEDs. I have seen it in motorcycles before, but I don't know how to fix it. I found a thread about modding the flasher relay but it was for a TJ after adding LED fronts as well.

So, any ideas?

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Old 04-21-2012, 09:50 PM   #2
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When I did my LEDs, i got the ones with the internal resistor, After swapping hazard with blinker flashers, they worked as if I installed OE bulbs...

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Old 04-21-2012, 10:24 PM   #3
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Get a electronic flasher .. Any part store should have one that works
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Old 04-22-2012, 01:34 PM   #4
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Yep, electronic flasher did the trick. Thanks.

It's odd though. Before I bought it I thought I would try the flasher for the hazzards and it worked. It had a different part number on it than the one for the signals but it was still a thermal flasher. I bought another thermal flasher with the same part number (different brand) and it didn't work either so I sprang for the electronic.
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Old 04-22-2012, 07:11 PM   #5
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Oh yeah, I forgot to mention the part numbers. The first two are what was in my 90YJ, I assume they are OE but not sure.

T/S flasher: Wagner 224 ; does NOT work with LED tail lights

Hazzard flasher; Wagner 552 ; Does work with LED tail lights (oddly, the LittelFuse brand 552 does NOT work)

Electric flasher: LittelFuse 232 ; Does work with LED tail lights
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Old 04-22-2012, 08:06 PM   #6

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By way of explanation the older thermal flashers require the amount of current that an incandescent bulb draws from the 12V supply to heat the thermal bi-metallic strip which is shaped like a clicker. When the thermal bi-metal heats up it flexes the "clicker" disconnecting the bulb(s) and then cools to reset the "clicker" and thus begins a new cycle of on and off. The LEDs (collectively) do not draw anywhere near the amount of current that the bulb(s) would therefore would not trip the "clicker" and thus the LEDs stay lit constantly. The electronic blinker uses a switching circuit probably made with transistors and a 555 timer or equivalent timer to turn the LEDs on and off. the reason that the emergency light blinker worked is because the "clicker" mechanism was able to be flexed by the amount of current that the LED blinkers were drawing through it.


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