67 left turn signal issue

[67L78]

When I turn on the left turn signal both front signal lights flash but kinda dim. Rear lights work properly as does the right side in front. When I turn on the parking lights the left front does not come on. When turning on the parking lights I see the left turn signal indicator in the dash flash on but briefly. I think its a ground issue but have checked all places as shown in the electrical schematics. Any suggestions would be appreciated.
Thanks,
Richard

[Kelley W King]

Check your lamp filaments. There are two in parking, turn signal lamps. If they heat up and touch weird things can happen.