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I have a 1975 coupe. When I have the lights off, both the right and left directionals work fine. When I turn on the lights, the right directional does not work. The flasher work with both the lines on or off. The headlights are electrical. Any advice would be greatly aopresciated.
I’d start by checking grounds. A good multimeter or Power Probe is your friend here.
Have you changed any of the parking lights, directionals, or marker lights to LED? That can cause issues with the directionals. Do a search on the forum and you’ll find tons of information. When you search, look for “turn signal” or “blinker”. You won’t likely find much under “directional.”
Good luck and let us know what you find so others may learn!