96: Search for the Perfect Connector
-- revised 2/10/2017 --

Here's some recent purchases:

The white spring clips are cheap, easy to use, fairly secure, not waterproof. I've had some of the 2-wire type for a year. They are useful while you are messing around. Generally better than alligator clips.

The lower set are pretty much the opposite: secure, waterproof and not cheap. And once you snap one of these suckers together it's work getting them apart. But really waterproof. Also, they could use a screw-down hole like the white clips.

REVISED: The spring snap closures (right end of black connectors) are brittle in cold weather.

The search goes on...