Splicing or not on the 12v side of a halogen lighting system
You should be able to find a good assortment of the crimp on terminals at any hardware or auto parts store. From your description it sounds like your terminal looks like this:



If you do not have the appropriate tool to crimp the terminals onto the wire you can purchase one at the same location that you get the terminals. A low cost crimp tool will likely look very similar to: