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Don Macleay

LED turn signal conversion problem

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Switching over to LED's ran into a snag on the turn signals. 

With LED's in the back and old bulbs in front using a stock flasher it all works fine. 

Put in 4 LED's, and all 4 come on, no flashing.

Put in electronic flasher, and all 4 flash, no difference between left and right. 

Suggestions? 

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I had the same problem. You need to replace the indicator bulb in the dash panel with a pair of green LEDs back to back, and wire a ground to the back. Otherwise all the indicators will find a ground though that little bulb to the other half of the circuit. 

https://www.v11lemans.com/forums/index.php?/topic/20690-led-blinkers-lr-blinking-at-the-same-time/&do=findComment&comment=238063

 

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You can also use a single LED with a pair of diodes to prevent cross talk, that's what I have on my loop.

Here's a sketch I did for someone, In the first diagram I explain why its no problem with incandescent lamps

The second diagram shows cross talk

1948-001.jpg

The third diagram shows how back to back diodes prevent cross talk, any small diode will do eg 1N4004.

Note: All 12 Volt LEDs incorporate a series resistor to limit the current to 15 mA or less, I haven't shown these for simplicity.

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Whew , I would run the LEDs in the rear and live with it . 

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1 hour ago, gstallons said:

Whew , I would run the LEDs in the rear and live with it . 

That's what I resigned myself to. Along with the flashing brake LED and LED headlamp unit.

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