LED Tail Lights - Vintage Mustang Forums

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post #1 of 8 (permalink) Old 11-04-2016, 01:27 PM Thread Starter
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LED Tail Lights

I purchased the Sylvania Zevo LED to replace my 1157 on my 67 Mustang, but they will not blink, however they stay stuck on Bright like they wanted to Blink. Do i need to add a resistor before the light socket? Or add something else?
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post #2 of 8 (permalink) Old 11-04-2016, 02:18 PM
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I'm not completely familiar how a '67 works, but you may need to install an LED compatible flasher. I did with my '69. The resistor idea may work as well.

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post #3 of 8 (permalink) Old 11-04-2016, 02:24 PM
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I did resistors on a '40 as I did the taillights only. After words I found they make special flashers for the LED bulbs, and I think even ones for mixed LED and regular bulbs. The LED's don't draw enough voltage to trip the flasher unit..

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post #4 of 8 (permalink) Old 11-04-2016, 06:59 PM
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PM GTONavy on this forum and see if he can give you some insight. I purchased his sequential tail lights and he had me install a different flasher for his tail lights.

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post #5 of 8 (permalink) Old 11-04-2016, 07:27 PM
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Conventional flashers work on circuit resistance causing a bi-metal strip to heat up and bend, breaking the circuit, then cooling and re-establishing contact. LED's have much less resistance and won't heat the strip enough to bend.

You can either replace the flasher with a solid state unit that doesn't rely on load, or add resistors to make up for the lost load.
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post #6 of 8 (permalink) Old 04-21-2017, 03:48 PM
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you prob had the bulb 180 degrees off in the socket.
66/93project and artc like this.
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post #7 of 8 (permalink) Old 04-21-2017, 10:47 PM
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The low current draw of the LED's require a flasher compatible with the lower current.

Neil Hoppe

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post #8 of 8 (permalink) Old Yesterday, 01:28 AM
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You will need an LED flasher (turn and hazards) like this one.


It must have the extra ground wire.

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1967 CV 289 A Code
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