Head and tail light wiring question

[74 New Hamp]

The other night I hit a nice New Hampshire “frost heave” and now with every little bumb I hit, my lights flick off and back on. Where is the best place to start looking for the problem? Both head and tail lights (and dash as well) are all affected, so I assume the problem is somewhere around the switch.
Is there another place other than the switch that all the light wires come together?
Thanks for your help.
Mark

 

[brian72]

check your grounds...at the switch and at the headlights.