[prophet455]

Working on converting the lights to LED but when installing the front turn signal lights, the turn signals and side markers no longer work. Specifically the turn signal/driving lights don't flash and the side marker lights don't work at all. The flashers are already low draw type with separate ground. I assume the side marker lights are basically feeding through the fronts and cannot get enough through the fronts when the fronts are LED. If someone has a diagram or such to explain the crazy way these front lights work or if someone knows how to make this work/why - please let me know. Best I can tell (from the little time I have had to look into it) there is a little bit of creativity in the way the wiring is done to make the side markers flash with the turn signals - possibly the side marker ground turning into a second hot signal to cancel the potential across the lights?

[johnta1]

Try this link:

LED Lights

[prophet455]

thank you, but hyper blinking is not the issue. I thought about a resistor inline like is often needed but I can wrap my mind around why it would help if I can get the side marker light to function at all. May try it anyway because I don't have any better ideas.
Does anyone have a functional diagram of the 70 front light system by chance?

[johnta1]

When I first looked at LED lights, the problem was that the LED didn't use much voltage which the flasher needed for it to blink.
(the flasher heats up, flashes, cools off for lights, then repeats)

So, probably a resistor would work.

With the new flashers made for LED bulbs, I would think they would solve the problem?
(electronically flashes, not by heat)

If the LED/bulbs light up but don't flash, I'd say you need the flasher for LED's also.



Posted a pic of diagram.

[West Coast GTO]

I found, when trying to convert to these type of bulbs, that the ground connection and hot were reversed at the bulb itself and was throwing a left turn indicator in dash on constantly and no control over turn and side marker lights.
I think there is a thread regarding this in the Search area on this site.

[Aus78Formula]

http://www.78ta.com/HTAF/index.php?a...;topic=46183.0

[johnta1]

Another version:

[mbeeman400]

I had the same issue on my 70 TA. Converted tail lights, side marker lights both front and rear, front turn signal lights, interior lights, dash etc. to LED.
Blinkers would not work. Replaced the blinker with the LED style. Still nothing.
Same issue when converting to LED on my 72 Corvette.
So I installed fresh incandescent turn signal bulbs in the front and turn signals THEN worked. Same deal on the Vette.
Tried couple different brands of LED bulbs in the front, to no avail.

[Aus78Formula]

That's right, that's how they are wired and LED don't work that way.