Up for sale is a Vintage saab Headlight relay. This is the primary cause of non working headlights in early Saabs.  This unit, functions as the bulb relay, and passes current through in order to power the lights.  If this relay is defective, the current pass-through will not happen, typically intermittently, which will cause intermittent headlight non function, on one or both sides.

This is a good used unit for sale here!  30 day warranty.