[32phil]

As a rule, I solder only AFTER the connection is properly crimped.
In a former life I was an electronics Technician and spent my career repairing/maintaining Medical instruments in hospital labs and physician's office labs.
The reason I always crimp first is that crimping gives a good mechanical grip on the wire. When you solder after it gives a better electrical connection. If the joint overheats the solder could melt out but the mechanical connection will remain. In an automobile vibration is a big factor as well. I always shrink tube the exposed end of the connector to help strengthen the joint.