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Old 01-07-2016, 03:16 PM   #1
Reserector
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Default How To: make your corner markers blink as turn signals

I was fixing some broken links in older articles and thought I would share this here. Nothing new, but maybe you haven't seen it.....

Some vehicles have corner markers that do not flash. They typically use a two wire bulb with no provision for a flashing lamp.

Making your non-flashing corner markers flash is easier than you think. By cutting one wire and adding a jumper, you can make your marker light flash alternately with your turn signal.
The way it works is this; you cut the ground wire to the marker light, and splice it into the turn signal's power (flashing) wire, it then grounds through the turn signal lamp. Now, every time the turn signal lamp energizes, it cancels the marker light. When it de-energizes, the marker light grounds through the turn lamp. And so on, and so on.

Here is a crude diagram:




Here you can see the ground wire cut, and a jumper connected. No need to do anything more with the cut end of the ground wire, because it is just a ground wire.


Here you can see the jumper spliced into the turn signal wire. The ground wire and marker light wire are left alone.




Click for video:

Protect and fasten the wires as needed, and that is all there is to it.

Last edited by Reserector; 01-07-2016 at 05:11 PM.
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Old 01-07-2016, 03:47 PM   #2
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I've been meaning to do this. Thanks for the concise writeup and wiring diagram!
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Old 01-07-2016, 03:54 PM   #3
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What no wire nuts?
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Old 01-07-2016, 03:55 PM   #4
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What about LED applications too? I thought I read somewhere if you are all LED it wont work.
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Old 01-07-2016, 04:32 PM   #5
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Am I missing something or? You say to cut the ground going to the marker light and splice it into the power wire going to the turn signal:

"you cut the ground wire to the marker light, and splice it into the turn signal's power (flashing) wire,"

But in the diagram it shows the ground for the marker light tied into the ground for the turn signal, not tied into the power for the turn signal?

I know it's not your diagram just wondering about that?

Also where does the parking light ground to when just the marker lights are on?
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Old 01-07-2016, 04:54 PM   #6
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Old 01-07-2016, 05:14 PM   #7
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You are absolutely right. That diagram was garbage. I fixed it, and made it match what I did. Thanks for pulling my head out of my butt.

To answer your last question:
Marker lights off, turn signal on - Power from the turn signal also powers the small corner marker bulb, which then finds its ground by passing through the big bulb's marker filament to ground. The small bulb does not draw enough current to make the big bulb's filament glow.
Marker lights on, turn signal on - The small bulb is powered by the same power that supplies the marker filament of the big bulb. But now, when the turn signal supplies power to the OTHER side of the small bulb, it sees equal power on both leads and cancels out. It is the same as no voltage on both, because there is no FLOW.
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Old 01-08-2016, 12:23 AM   #8
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good writeup. this is now a sticky.
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Old 01-08-2016, 12:32 AM   #9
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Ok, makes sense now, had me wondering as the instructions didn't match the diagram.
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Old 01-08-2016, 01:39 AM   #10
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Quote:
Originally Posted by hardbodyhero View Post
What about LED applications too? I thought I read somewhere if you are all LED it wont work.
LED will probably pop with this method.


I have my corners blinkered the same way as he wrote up. Its neat for sure!
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