Tail lights and fuse

Yesterday, i was cruising to work and hit a multiple bump in the road, saw a little flash under the dash and the lights, clearance, and as it turns out the tail lights went out.

I looked at the fuses today and the one that handles the tail lights keeps blowing as soon as i put it in, the 20 amp fuse.

Anyone got any ideas on where to start.

Does anyone have a link to a 71 Scamp Wiring diagram, cant seem to find one anywhere.

Thanks