taillight problem

hi everyone i have a 1990 honda civic and i have a taillight issue.
whenever i turn on my headlights the taillights dont turn on. there is nothing wrong with the fuse or the bulbs because when you press the brake peddle, it turns on.
when i start the car and i turn the lights on, the taillights position light turns on. when i start driving, it turns off automatically.

i am the second owner of the car and the previous owner was the one who did this mod and i want to fix it.

i want to be able to drive at night without the cops pulling me over because i already got a warning.

thanks for your input

The tail light bulbs should have a double filement*(wrong spelling). 1 for tail lights & 1 for brake lights.

i am the second owner of the car and the previous owner was the one who did this mod and i want to fix it.

Who know what some hack did to the car before . . . .

well i heard that a year ago quite a few ppl did that to their taillights because those ppl thought it was cool