Merc uses weatherpack and mertipack, livorsi uses deutsch.

Caterpillar uses Deutsch, so that says something.

Anyone have preferences here?

I dont think you can go wrong with any of them as long as they are put together properly. I have never played with the deutsch connectors but I have tested a 3 pin weather-pack completely submerged underwater for over 2yrs on one of our pumps we make here at work.....the motor failed before any liquid got inside the connector!....still looked as good as the day i put it all together.

Deutsch all the way! I build prototype machines, and have tried them all. There is no contest in my opinion. The crimps are stronger than the wire, I have never had a bad connection.

I use all three at work also. Deutsch prolly the best. nice thing about them is you really dont need a special tool to crimp them or remove them from the plug. tho they do crimp better with the tool. a 2 pin all the way up to 12 pin you can take apart with a small screw driver. once you get to the big round 32 pin ones you need a special tool to get them out tho. weather pack is prolly the second easiest to take apart the one round tool will do them all. some of the metri pak ones are a real pain to remove the pins. and you need a special crimper to assemble them to. i used metri pak rewiring my entire boat but thats onlys because my msd 6ls box uses metri pak. next time i will deff use deutsh.

I went Deutsch, AT series. Turns out we have the crimp tools ($$$$) at work for solid pins and I had the tool for stamped pins. Can't wait, it's gonna be good stuff.

Mercruiser uses these and IMO for the top of the list

www.molex.com

www.deutsch.net

Where is a good place to purchase the Deutsch and tool? Didn't look like the factory site is for sales.

i use molex..

Wirecare.com has a good selection

Thx