On changeing the bulkhead terminals (packard 56), on the male ones, one leg is open but you can tell which one it is when they are in there but push both of em inward slightly & you will see which one is moveable & push that one in a bit till you can pull the wire on it out the back side. On the female ones reach in with an eyeglass mini screwdriver & flatten the "tab" till you can pull the wire with it out the back side. Dont force either one, when you have it bent just enough/right amt the wire/terminal will easily pull out the back side. New terminals: raise the tab on the female ones a bit to where it "snaps" into place as you pull it via the wire backwards into the bulkhead. the male ones, no prep just pull em backward till it locks. Take a spare male one (buy an extra) & fit it into the installed female ones before installing em to insure a good fit on each one (bend the curved edges as needed) then see if the bulkhead halves fit together (easy at first) as all of em need to line up dead on. Some have recommended a dielectric paste (not sure on that), others will advise. NAPA has the terminals for 99 cents ea (pricey) 725145 and 725147 or they are online in quantity for cheaper. I am in favor of running the (2) main in/out heavy wires straight thru & soldered/no terminals (Nachos' bulkhead parallel bypass) & you leave some length of wire behind the dash behind the bulkhead on those (2) so if you have to pull the forward bulkhead half forward in the future it will pull that 6" of connected wire(s) out with it.