1995 Chevy Astro Daytime Running/Backup Lights

Electrical problem
1995 Chevy Astro 6 cyl Two Wheel Drive Automatic

First of all my daytime running lights do not work at all, the fuse looks good, and the headlight assembly recently replaced (did not work previous to replacement).

Second, back up lights do not always work, e.G. I can be backing into my driveway and they do not work, I may hit a bump and they suddenly work.

Any ideas?