I'd say grounding problem. Power going to the signal lamp filament can't find a ground there so it travels through the park light filament, back through circuit to the other park lamp.


"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
1954 GMC Suburban Now with a new proud owner.