Darn Parking Lights!

Disregard the dome light. It has it's own feed wire.

When you pull the light switch out one notch, all the parking lights, side lights, and license plate lights should go on. [the rear parking lights are also called taillights]. This system is independent of stop and blinker lights in your car.

The blinker lights are fed thru the ignition switch. The stop light feed is always hot. The stop light wiring goes thru the blinker switch. Normally both bulbs turn on. When the switch is moved to either position; the contacts are broken for that side.

Check for a single filament bulb instead of an 1157.