GMP440:
The lighting system in my car was terrible when I got it, had to re-build almost the entire system.
I decided to add the headlight relay kit and do it all at one time.
I replaced all the bulbs with LED's, except for the headlights, those are (4X) new sealed beam.
Most of the bulbs were burned out, broken or missing, sockets missing, and not good contact in some sockets.
I replaced a lot of wiring, changed out or added about 6 sockets and added a new turn signal flasher for LED's.
After the headlight relay kit was installed, lights were very dull before, super bright after.
All running, brake and turn signal lights work perfect now.
I wish I could speak to before and after for the interior lighting, but it was crap with 50% working.
All the broken and missing lights are working now, this project is finished.
I do not notice any dimming on dash, head lights or anywhere else when driving.
This may be due in part to LED's using less juice too.
Don't ya' love old cars, get some tools out !!