There was a discussion about GM Weatherpack and the similar Metripack electrical connectors on here awhile ago. I love these connectors - even though they're relatively expensive - they make a great connection and they're weatherproof. What I HATED about doing them is the crimper I had made it very clumsy to hold the "end" - insert the wire - with the silicone boot and get it all inserted into the "end" and get a good crimp. If you jiggled just a bit - the wire would not get crimped or the boot would not -- etc... SO after that discussion I went in search of a better mouse trap... and ordered these DELPHI crimpers. WOW is all I can say! They hold the "end" you just insert the wire with the boot and crimp away... it makes a PERFECT crimp and unlike my other pair - these crimp the boot ROUND -- so it's not cut or damaged and retains it's shape. SO SLICK! Well worth the rather high price of $129 I found on the internet... a good tool can make you actually appear to have some skills!
SORRY THE PICTURES KINDA SUCK!
Now if you look --- you can see the END loaded into the tool
Load the "boot" on the end of the wire
Shove the wire with the boot in....
Makes a perfect crimp!!