1982 Chevy Truck No headlites

I cant get the head lights to work. I had brake lights and tail lights but now nothing? Fuses are all good my uncle borrowed the truck and the spare tire fell out going down the road, and ever since the lights have been not working properly. I have a new alternator Please help I need my truck for work and I am not good with wiring. I think the same problem is draining my battery after a couple of days of starting I have to charge the battery and I have double checked the NEW alternator for correct output and it is putting out over 12.20 volts at Idle. Thanks.