Your park lights weren't wired to run with the head lights. If you want them to you will have to rewire them at the switch. Then, unless you do some fancy trick wiring, you won't be able to use park lights separately.

"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.