63 Dart Mystery Circuit Board Washer

The washer looks like one that goes on the radio posts to hold the bezel on. Does your dash dimmer in the light switch work to dim the dash lights properly? When does your fuse blow? At one particular time when something is turned on......such as just the parks lights setting? Only after a certain length of time? Have you confirmed it's the correct amperage fuse? Correct bulbs in taillight sockets?