I recommend you purchase some good marine connectors. Their a little more
expensive but certainly much more reliable for something that is "up the
mast"..

Get the kind that have a shrink sleeve over the outside. You just crimp them
on using a good crimping tool. Then you heat shrink the sleeve down onto the
finished connection.

The real good connectors have a adhesive inside that seals the job.

The moto here is "don't go on the cheap" with anything up the mast.

Steve
s/v Good Intentions