Just went out and looked at my '93 Dynasty. There's five large fuses along the rear edge of the fuse box. The "Lights" fuses is the red one in the middle. It's a 50 amp. If that fuse is blown you have a real problem. A pair of high beam head lights only draws around 12 amps. It's more likely you have a defective head lamp or dimmer switch or the terminals in the electrical connectors have overheated. You might want to find a used fuse box cover in a salvage yard. Leaving those fuses and relays exposed is inviting trouble from corrosion when rain water sprays in there.