1978 Blinker problem
You can see, the yellow marking lights works ok when blinking. They blink, go out and blink
The front daytime running lights blink, dim, and blink. My MOT guy demands they go fully
out when blinking. Apparently, it's the law here en Denmark. I told him, that's
how they work fom the factory. But he doesn't care.
A guy told me to get a new flasher relay. Is this the correct way? Which flasher relay should i get?
i suppose it's not a standard one since it has to change the amp's i guess? i would like it to blink a bit slower as well.
Or should i rewire the wiring, so the orange marking lights connects to the Daytime
running lights? won't that make the lighting very dim?
This weekend i redid the whole lighting harness and the fuse box received an overhaul. it looked nasty, so everything is in great condition at the wire harness.
Not exactly what the MOT wants, but the wiring diagrams might help.
https://www.corvetteforum.com/forums...s-learned.html
It was not a small amount of effort to make them do this (with working DRLs, which will work even better in your car with clear lenses). The details, and the parts needed, are in the thread. A new LED-capable 3-wire flasher might be sufficient to get started.
It is not clear to me that BOTH are on as the video starts when the right turn signal is already flashing.
When you move over to the left side of the car the front left parking light is definitely OUT before you select the left side.
Headlight Switch ON Circuit #9 will power one side of both front #1157 Bulbs.
L or R turn selected either Circuit #14 or #15 powers the other filament of the front 1157 bulb(s)
If any of the bulbs are defective in the L or R circuit it can affect how each circuit(s) work.
This photo is from the 1978 Corvette Electrical Troubleshooting Manual with circuit operation included.
I omitted the Brake Light portion of the circuit operation text...
I would say other than a possible faulty front left 1157 bulb it looks like the circuit is working as designed.
To do that Circuit #9 could be removed (Brown Wire) from the turn signal extension harness connector.
You would still have side marker lights through Circuit #9.
You would NOT have front lights when the headlight switch is pulled.
To do that Circuit #9 could be removed (Brown Wire) from the turn signal extension harness connector.
You would still have side marker lights through Circuit #9.
You would NOT have front lights when the headlight switch is pulled.
The Best of Corvette for Corvette Enthusiasts
Electronic LED Flasher Relays have no minimum load-12VDC. Eliminates the need for load resistors, turn signals will flash at normal rate with or without LED bulbs. Use the Flasher Selection Guide to determine the correct Flasher Relay for your vehicle.
You can usually get these at any auto parts store.
Circuit #9 is a direct feed from the headlight switch and will illuminate one side of the 1157 duel filament bulb anytime the headlight switch is in the first or second position.





My situation was in Australia you can not have a amber running light. it has to be clear.
My solution was to add an extra socket to the back side of the housing. if you look you will see that the original socket is off to one side. so I installed a second socket that now runs a white or clear LED bulb in it. and the amber bulb is just a turn signal bulb. in the beginning I had an issue with the clear bulb shining light through the amber bulb. I solved this issue by running a amber bulb with a small globe head. I'll try to get a couple photos shortly.
This should solve your problem however.
My situation was in Australia you can not have a amber running light. it has to be clear.
My solution was to add an extra socket to the back side of the housing. if you look you will see that the original socket is off to one side. so I installed a second socket that now runs a white or clear LED bulb in it. and the amber bulb is just a turn signal bulb. in the beginning I had an issue with the clear bulb shining light through the amber bulb. I solved this issue by running a amber bulb with a small globe head. I'll try to get a couple photos shortly.
This should solve your problem however.





Backside of turn signal housing. Note the large white socket is the factory socket. as you can see it's offset to the left. the new socket is a socket I cut out of an old gauge. It holds a clear single filament LED bulb. Simply cut the running light wire off of the original twin filament socket and run to this new socket. Perhaps you can tell by the photo, this modification was done some 15 years ago. Still working fine.
Standard front running/turn bulb on the left. replacement mini bulb on the right. with the standard size bulb the white light shown through the amber bulb creating a amber edge on the front light. With the mini bulb no issues. These mini bulbs were used in Harley's with custom signal lights. Try an aftermarket Harley type work shop to locate them. The drag Specialities part number is on the box. I bought a box of 10 15 years ago. I have 7 left.
With 2 separate sockets. your amber bulb will go out completely. even if your running lights are on.
Got me compliance in Australia.
Last edited by 4-vettes; Jul 13, 2022 at 03:26 AM.





Front light with just running lamp lit. it's white now instead of amber which makes the Australian government happy.
Best attempt at getting a photo of the amber signal. I assure you it looks much better in real life. And goes out completely with running light on or off. As now running light is white there is no confusion.
Rear lighting solution, Also need amber signals in the rear here. Also a twin socket setup. In this photo tail light only is on.
And signal flashing, once again, very hard to photograph.
Hope this helps.
Front light with just running lamp lit. it's white now instead of amber which makes the Australian government happy.
Best attempt at getting a photo of the amber signal. I assure you it looks much better in real life. And goes out completely with running light on or off. As now running light is white there is no confusion.
Rear lighting solution, Also need amber signals in the rear here. Also a twin socket setup. In this photo tail light only is on.
And signal flashing, once again, very hard to photograph.
Hope this helps.
Thanks. If you want, you can upload to YouTube, and link the video here, that's easy enough :-) i would love to see it live, and show it to my MOT guy before i do the job.
So that new plug you added holds the daytime running lights, and the new orange bulb is in the original socket, and when you blink, the orange bulb is so powerful, it blinks so bright, it overrules the white led?
Last edited by Simonp3; Jul 13, 2022 at 03:50 AM.










Yes. definitely over powers the white.
















