Mike
I'm not sure about the blank rocker switch space. My 45d has a power and ground plug, that's hot when the key is turned on . It's right next to the right side seat belt, tie stapped along side the seat. On my tractor it was not being used(no rear work light), but my guess would be, it's for a factory light. I think, I read something about someone checking with a NH dealer( It may have been JIM with the TC18) and they sold a "NH Light" with an on/off switch built into the light.
Your other question about the 16la, it does has a float postion, and the two dump cycles. The dump cycles( I tried following the regenative and non-regenative thread a while ago, but I got lost half way throught it/w3tcompact/icons/smile.gif) With my 4n1 the farthest dump postion drops the bucket closed, so I don't use it.