Battery draining fast

Pete in NH said

The other end is a bit too heavy to get into the bulk head connector pin. So, there are two ways to deal with that. The first is to use a very short piece of wire that will fit the pin and splice it to the fuse holder wire.

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The OP has '65 A body so he has the bulkhead connector that has 2 separate screw terminal lugs in the connector: one for the fusible link connection from the battery and another for the alternator connection. So he has the best bulkhead connector setup; he essentially already has a form of the Mad Electrical pass-through in the bulkhead.