On Fri, 20 Jan 2012 09:36:28 -0500, Oscar
wrote:

If the wire is tinned, what about the ends where it is cut?

If it worries you put a tiny dab of nail polish, color of your choice on
the ends,,,,,,, or stop worrying, nothing will happen. It will be
crimped and sealed, right?

The ends of the small tinned strands could develop microscopic
corrosion spots but it will not spread beyond that point. Ideally
all connections should be crimped and sealed with heat shrink tubing.
It is also important to leave a "drip loop" so that water is not
carried into the connection via gravity.

http://www.thevirtualboatyard.com/2009/02/keep-the-wiring-dry-with-a-drip-loop.html