1993 Nissan 300zx Son Turns On Headlights Only High Beams Come Low Beam Will

When my son turns on his headlights only the high beams come on the low beam will not work. Also the tail lights, brake lights and dash lights will not work when he turns the headlights on. However the brake lights will work when he turns off the lights. I can't afford to bring it to a shop to find the problem. Please any suggestions would be very helpful!