ok so, you need to proceed cautiously at this point. It sounds like the fusible link went bad. However I am concerned about the spark against the dash. This would not normally happen if the link died. The link is a small length of wire connecting to the bulk head connector in the engine compartment. The wire will usually have a tag that says fusible link, or the wire will have FUSIBLE LINK and the gauge of the wire printed directly on it. You must buy fusible link wire do not use regular wire. Fusible link wire is designed to give out so you do not fry anything else. Ask specifically for the one that works for mopars, trust NAPA, or a good local parts store, forget the other guys, they may try to sell you a fuse. However you must remove the dash cluster and inspect the red input wire going from the bulk head connector to the ammeter gauge. What you are describing sounds more like something is hitting the red ammeter positive wire. I have forgotten to tighten these before and yes they do create a nice spark if grounded. If anything is hitting this , you have a potential for a large fire. I have messed around with enough early a bodies where most have had either melted bulkhead connectors or wires with no plastic sheathing anymore because at some point they got really hot. The cars are notorious for having problems between the bulkhead connection and the ammeter gauge. The ammeter wire supplies power to the ignition switch which explains no power. Like I mentioned before be very careful and carefully inspect the red ammeter wire from the gauge to the inside of the bulkhead connection.
Here is a link for the wiring diagram
MyMopar - Mopar Forums & Information - Mopar Wiring Diagrams 1960 to 1965
Good Luck!
ok so, you need to proceed cautiously at this point. It sounds like the fusible link went bad. However I am concerned about the spark against the dash. This would not normally happen if the link died. The link is a small length of wire connecting to the bulk head connector in the engine compartment. The wire will usually have a tag that says fusible link, or the wire will have FUSIBLE LINK and the gauge of the wire printed directly on it. You must buy fusible link wire do not use regular wire. Fusible link wire is designed to give out so you do not fry anything else. Ask specifically for the one that works for mopars, trust NAPA, or a good local parts store, forget the other guys, they may try to sell you a fuse. However you must remove the dash cluster and inspect the red input wire going from the bulk head connector to the ammeter gauge. What you are describing sounds more like something is hitting the red ammeter positive wire. I have forgotten to tighten these before and yes they do create a nice spark if grounded. If anything is hitting this , you have a potential for a large fire. I have messed around with enough early a bodies where most have had either melted bulkhead connectors or wires with no plastic sheathing anymore because at some point they got really hot. The cars are notorious for having problems between the bulkhead connection and the ammeter gauge. The ammeter wire supplies power to the ignition switch which explains no power. Like I mentioned before be very careful and carefully inspect the red ammeter wire from the gauge to the inside of the bulkhead connection.
Here is a link for the wiring diagram
MyMopar - Mopar Forums & Information - Mopar Wiring Diagrams 1960 to 1965
Good Luck!