Hey Big Al!
Good to hear from you down under again.
As a former electrician, my recommendation is to not use insulated terminals etc., at all. Slip some heat-shrink
insulation (preferably with glue/sealant) over the wire ahead of time, then use a crimping tool that is for non-insulated terminals, and then slide the heat-shrink
insulation up over the area and seal it up. Or you might use the newer insulation that can slip right over the lug ring cos it has a higher degree of "shrinkability".
I have found over the years that these tools for bare terminals, such as my trusty Sta-kon brand, never fail me as not only is the wire and lug compressed, but they drive a "pin" into the compressed area that prevents the wire from ever loosening. Many times I have come across other wires that are loose inside the insulated lugs etc because the tools do not have the indent because it crushes the plastic insulation - and the plastic often breaks off. Two nearly parallel jaws that compress are not nearly as effective as the indent type.
Someone mentioned Klein tools, which are - or at least used to be - a top American line of electricians tools. I can't part with mine.
Also, it might be nice to have the expensive, tinned copper wire, but if the connection surfaces are sealed with dielectric compound then they can't corrode anyway. So save some
money, twist the strands and dip the wire in it before you crimp. The compound is squeezed out where compressed surfaces make contact, and seal the whole join from
corrosion.
Another suggestion is to always give the wire a serious "tug test" on completion. A slight jarring could have made the lug move slightly on the wire. Or it might have slipped while you were looking for your beer!
So please do not trust insulated lugs etc. Remember, loose connections lead to heat which leads to fires.... in
boats or buildings!
Cheers,
RR.