Thus spake Bill:

Anyone know where the black wire on the spa should be connected?

You need a wiring diagram. They are in the Pre-delivery instruction manual,
available (listed by the model/year of your spa) on this page:

http://www.hotspring.com/Hot_Tub_Cus...er_manual.html

They are PDF files for which you will need an application that can view
these.

Good luck,
Dave
--
DaveC

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