headlights come up but won't turn on
 

I'm having illumination issues with my '79. The lights will flip up, but they will not turn on... low beam or high beam. This happened all of a sudden too. Everything was going ok, then I stopped for about 15 minutes to buy something at a store. When I came out the lights wouldn't turn on. I've checked the fuses and they are sound. I'm pretty sure not all 4 lights would burn out at the same exact time.... So, is it a wiring problem of some sort? What's my next step? Thanks.

check fusible links.

A. Fuse.
B. Forward lamp harness ground on the radiator support.

If neither of those work, you probably need a light switch.
:thumbs:

My headlights just quit working. If I pressed the high/low beam switch, the lights would go on, until I took my foot off. The high/low beam switch was shot.

I agree, high beam switch