In case it was lost in the noise of my long LED post, I have a solution for good-enough DRLs that retains full functionality of all other lights, and uses LEDs everywhere.

This is especially cool in my 80, which was the first year for cornering lights. With a pair of LED 1156 bulbs, those lights are bright!

Here's a video of my 80 going through all combinations of light operations. Video now includes a running description.

 

Here's the modified wiring diagram I used in the corners. More details are in the related LED thread. Clear front lights would make this even better, so I'll have to convert my 79, too.

https://www.corvetteforum.com/forums...s-learned.html

 

I have LED DRL in my 65. I would think it would work on a C3. I wired my front marker lights to the accessory terminal of the ignition switch and used switchback LEDs in the stock front bulb holders. The marker lights come on bright white with the ignition on and flash yellow with the turn signal. I do not have side marker lights. Pretty easy and no extra modules.


Tom

 

Looks great! I like how the front lights are dual purpose - white DRL / parking light yet amber when turn signal is on.

 

Thanks for the feedback!

The C3 wiring is a bit different. I may have explained it more clearly in my longer thread.
https://www.corvetteforum.com/forums...s-learned.html
Wiring diagrams for most years are here.
http://wordpress.keystonestatecorvet...m/?page_id=118

The GM terminology for the front-facing corner lights is both "direction signal" and "parking light", and from 1963 to 1967, that is all C2s had. They use two-element 1157 bulbs, and can be directly replaced with white/amber switchbacks. Thanks for confirming that!

In 1968, GM added the front, side-facing "marker lights", which operated with the parking lights only (and had a ground). Looking at the wiring diagrams, 68 through 71 C3s should also work right out of the gate with white/amber switchbacks.

Starting in 1972 (again, based on wiring diagrams I found online, YMMV), GM removed the ground for the marker lights. From 72-82, they shared the circuit with both the parking and direction lights, such that current flows in different directions through the marker light bulb at different times, and at some times no current flows, allowing the marker lights to flash with the turn signals.

In a 72-82 car, LED marker lights should break all of this, but you can get DRLs and front-only turn signals using white/amber switchbacks in these C3s if you remove the front marker lights (the rear marker lights work differently).

To get the full functionality shown in the video in a C3, you will need a pair of the Blinker Genies, (and LED flashers). The marker lights will then flash opposite to the front turn signals, but that seems fine. With a few extra diodes and extra wire, you could get the marker lights to flash with the turn signals, and to be off when the DRLs are on, but I wanted to solve the problem without adding more than a few inches of extra wiring, which I did.

Here's the important part of the 79's wiring diagram that shows the issue (trace out the wires in the full diagram to better understand). @Richard454 explains it best of all in this thread:
https://www.corvetteforum.com/forums...rn-signal.html

 

My '74 has:
LED headlights
LED side marker lights (all 4 corners)
LED switch back (white steady, amber flash) turn signals up front
LED tail lights / turn signal/ brake lights
NO LED interior bulbs (yet) that includes the turn signal indicators

No resistors (except the ones internal to bulbs) ( I bought LED bulbs that advertise no hyperflash)
I have (2) electronic flashers:
The one that is plugged directly into the fuse block is regular polarity
The one located behind the passenger lower dash panel has the reverse polarity base adaptor.
NO HYPER FLASH what so ever. None of my wiring has been modified.

My only complaint is when the Headlights are on my radio reception pretty much sucks. I have tried putting "Chokes" on the headlight wiring but it did not help

 

Thanks for the info!

I'm glad it worked, and you found a solution that doesn't require the Blinker Genies.

So you have non-Hyperflash bulbs, AND electronic (3 wire) flashers. FWIW, I had to reverse the polarity of the turn signal flasher, but not the hazard flasher. Both are in the fuse panel in my 80.

Perhaps the bulbs you used in the marker light positions are another solution? Do you have a part number for them? Perhaps, despite being LED, the allow current to flow in both directions, by having two internal circuits? Or the resistor allows for a path? Putting a single-direction LED in my marker light socket immediately broke turn signal function. Only the Blinker Genie restored it.

 

Nice write up Bikespace!!! Thanks for taking your time to put some light on the subject!!
It's frustrating when such a great invention like LEDs- are not used correctly- then considered junk by naysayers just because LEDs are misunderstood!!!
Been happening since cavemen!!!



There are two types of interference - conducted (travels through the wires) and radiated( travels through the air).

Conducted noise -can try the clamp on ferrite beads. Put them on each headlamp wire as close to the LED lamp as possible. If that doesn't work - a low pass filter on the input power to your radio- a car stereo place will sell those.

Corvettes - because of the fiberglass body- are notorious for having problems with radiated noise. Metal stops the radiated waves- but not fiberglass.
GM even knew this as on the first 53- by using ignition shielding. So shielding is usually how you limit radiated noise.
Bulbs that are built well and are EMC compliant - this should never be a problem. However consumer electronics don't need to meet these standards to be sold in the US, especially when the internet (eBay and China) are involved.Oh-and most bulbs use plastic bases- that will also not shield at all.

Richard