Headlights won't dim. Only have bright lights. Dome light on when headlights on.

What is your question?

When I turn headlights on they stay on bright. I replaced the main switch in the dash and tried the high low relay also. The dome light stays on when you switch to headlight on position. Had it checked on a computer and they can switch them to low and high beams from the computer. Had some water leaking from the sunroof drain being plugged up before this problem occurred. Any ideas?