Electrical issues

Ok I have 73 duster.having electrical issues with dimm8ng lights.no dash lights no turn signals.they have no flash in panel no arrows light up and no flash at lights.no relay click only lights that work are taillights.headlights.gear selector and radio.turn8ng dimmer works a little on dimming but go to far either way they go out.i also have to turn ac selector on to start car.found that out after month of using push button and key switch.one day happened to switch ac on car started rite up with key first time since I bought it.theres other issues 8m starting with these.and all fuses look good.