Hi Steve,
Just a thought. There are some great little battery operated navlights around. They have little brackets which attach to the boat, and the lights snap in when needed. I assume that the rules ( colregs ) are the same where you are: a vessel under 7 m (sailing or otherwise) only needs to exhibit an all-round white light and side-lights 'where practical'. Actually, as you do below 7 kts under power, if you carry a torch you can switch on in time to avoid a collision, you will be 'legal'.
On Kermadec, I do have navlights and a stern light wired in, which have never been switched on
. So, I won't be running cables in my next boat ... only a small battery for the wind instrument display. These days the wind sensors on the masthead are wireless and may need a new battery every 3-4 years. Ah, and the iPad for navigation (with an iPhone as backup). Plenty of redundancy, no wires and terminals to corrode, fewer holes in the boat, fewer $$ ( wires, switches, battery, solar panel, weight ! ), less work, ...
Peter