I used to work as an electronics technician.
To do some wiring that'll be bulletproof and last:
1. get wiring rated for under-the-hood heat (the wiring sold at auto parts stores is no good for that)
2. get crimp-on connectors
3. cut the plastic off the crimp-ons
4. put heat shrink tubing on the wire, well away from the end
5. crimp the connector on
6. solder the crimp joint using a thermostat controlled soldering iron
7. move the heat shrink tubing over the joint, and heat it with a bic cigarette lighter to shrink it on
8. voila!
P.S. Crimped connections don't last. After about a year, they'll work loose a bit from vibration, and corrosion will creep in, and you'll get a loose connection that is very frustrating to find. Soldering it prevents that from happening.
To do some wiring that'll be bulletproof and last:
1. get wiring rated for under-the-hood heat (the wiring sold at auto parts stores is no good for that)
2. get crimp-on connectors
3. cut the plastic off the crimp-ons
4. put heat shrink tubing on the wire, well away from the end
5. crimp the connector on
6. solder the crimp joint using a thermostat controlled soldering iron
7. move the heat shrink tubing over the joint, and heat it with a bic cigarette lighter to shrink it on
8. voila!
P.S. Crimped connections don't last. After about a year, they'll work loose a bit from vibration, and corrosion will creep in, and you'll get a loose connection that is very frustrating to find. Soldering it prevents that from happening.