News:
You should have a foot switch on the left of your floorboard. Press it in with your left foot, and presto. It's near the left kick panel.
what the secondary headlights (the pair closest to the grill) on the 70 challenger do and how to turn them on.
They are the high beams. As mek says, the foot switch. If they don't come on, see if they are burned out, or the foot switch doesn't work properly.