i'd start tracing wires by utilising your service manual.

you should have a ribbon wire, IE about 5 or 6 wires running along the top of the firewall from the drivers to passengers side. thats for your wipers.

reverse is the same thing, 2 bullet head ended wires running into the trans tunnel form the engine bay.

have you pulled the light knob out both clicks?
you push the indicator stalk towards the engine bay to get high beam and pull back for headlights.

got some photos of problem areas?

did you get this car qwithout a loom or what?