my EG civic came with the park lights in the head light and the the corners are just for the indicator. The harness at the back of the corner bulb only has 2 wires.

i want to know how i can wire my park lights so that the corners light up when i turn the park lights on. I know i need a double filament bulb but what do i do about the connector and the harness?

 

you would connect the grounds together ... and the low power wire (from the double filament bulb) would be connected to the wire going to the corner bulb and then the high power wire would be connected to the indication wire.