I actually removed the terminals at the bulk head. That's where the problem is. Drill thru the bulkhead and run the 10 gauge right thru the holes previously occupied by terminals. Leave the wire a little long on the interior side before splicing to the dash harness. That way if you have to remove the harness there is enough length to resplice. I've run a 110 amp alternator in my Challenger this way 16 years with no issue.
Doug