Scotch locks are literally the worst possible connection on the planet, DO NOT USE THEM! I ran a car audio shop for 10 years, all techs were warned to never use these connectors and any tech caught using these connectors was fired on the spot. How many people here have had them fail or not even work to begin with and had to go back to fix them? Just strip some of the sheathing back on each wire, twist them together, tape them up with a quality tape like the 3M super 33, and you're done. If you want to do it even nicer, cut both wires, strip the now 4 pieces of wire back 1/2", slip a piece of heat shrink tube over the 2 on the harness side, solver all wires together, and heat shrink them. This would take slightly longer but this is the best possible connection you can make.