And rear turn signals will not work when brake lights are on.

Correction. When brake lights are on, passenger turn signal works and drivers brake lights so not work. When drivers turn signal is on, passenger brake lights work.

Brake light on both sides work when pedal is depressed.

Running lights work. All bulbs have been checked, rechecked and swapped out.

Headlight dimmer switch does not operate the courtesy lights until it gets to locked position, than they come on. Until that point, only the tail lights come on, dimmer adjustable.