Review on Long-Lasting Posi-lock Connectors, 18-24 Gauge, Bulk Pack of 20: High-quality Electrical Wire Connectors for Hassle-free Installations by Clinton Youmans

This should be the easiest way to make secure electrical connections. All you need are some wire strippers and some basic motor skills to get it up and running. And most importantly, they are reusable. I use them everywhere but I think the toughest test is on my sport bike. If you run on the track at high speeds, you will notice that something is vibrating. I've spent 2 years on track days and it's still as safe as the day I made my first connection. I've used all types of connectors: Spade, Bullet, Swivel, Solder, etc. Posi-Lock is what you need. The only downside is that they are expensive compared to other types of connectors. However, as I said above, they are reusable.