I know this probably means I need to pull some wires in the dash...but has anyone had this problem?...the rear lights are on all the time, and when I put on the sidelights or headlights, they go out!- the opposite of what they should be doing.
Rear (and front) indicators still work fine all the time, and it doesn't affect the front markers- they come on just when sidelights are supposed to be on!

Any quick fix suggestions or do I need to get into the harness?

Thanks!