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    Modifying flasher for LED use


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    Modifying flasher for LED use Empty Modifying flasher for LED use

    Post by booth9c1ss on Tue Mar 24, 2015 8:39 pm

    LED taillights are efficient, long lasting, light up faster (I'm told 200 milli-seconds faster than incandescent, 1/5 of a second faster... about 20 feet at 60mph).  Because of the fast light up time, they can also make you more noticeable in traffic.

    There is a side effect, though.  The LEDs are so efficient that they make your turn signal hyper flash to indicate that a bulb is out.

    Some people install load resistors to get the flasher to work right, but they defeat the purpose of installing efficient lights.  LED flashers are available for $20-30.

    But you can modify your current flasher for free.  I'll show you how I did mine for a GM pickup.  Jeeps are very similar.

    Modifying flasher for LED use 20150324_194014_zpsf11d9b32
    Modifying flasher for LED use 20150324_194004_zpscdf4cdd0

    Open the case by gently prying the side tabs and sliding the cover off.

    Modifying flasher for LED use 20150324_193728_zpsd58d7450

    The above picture is actually the modified flasher.  In the picture, directly above the chip in a diagonal trace.  I cut/scratched through the trace.  This is the part that monitors the load.  Now it will just flash at one rate.  This will also work with the additional load of a trailer BTY.


    Modifying flasher for LED use Empty Re: Modifying flasher for LED use

    Post by Guest on Wed Mar 25, 2015 8:33 am


    When I modified the tail light format on Boomer the flashers were obviously all screwed up. VERY fast flash rate. I ended up replacing the thermal flasher controller (which most vehicles up until the last 5 or 6 years come with) with an electronic flasher. The electronic flasher doesn't use a bimetal element and current to control flash rate....just an electronic circuit. The old school flashers get messed up due to the electrical current increasing or decreasing as a result of different bulbs. That current is used to change the temperature within a small piece of metal which changes shape with temperature. As it heats up due to connecting a circuit, it warps and breaks the connection. This allows the bimetal to cool which then causes the warp to decrease which then makes the switch again. The clicking you hear from a blinker is that bimetal warming and cooling over and over.

    Electronic flashers are pretty cheap (under $10) and are available as replacements for most vehicles at your local auto parts store.


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