A hydraulic crimping tool that does a hex crimp, requires you to use the right die-set for your cable size. Every connection under the hood (or anywhere) where it might get splashed, requires a water-tight cover. When you install heat-shrink tubing over a connection, you can use a hair-dryer to shrink it. The seller listed about 4 postings up, also sells a hydraulic crimper at a good price, on his store site. About $56 US. You can cut the power cable with a hack-saw. There is an excellent article on safety at:
www.inc.com/users/evainc.html?111.