A wire from the brake light switch runs to the turn signal switch in the '60s column. Wires run from there to the bright bulbs. The dimmer bulbs are the tail lights.

"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.