Thank you, sir.From your datacard you just have the "booster" arrangement.
So: it will only operate when the engine is running
The bow-tie switch is (supposed to be) "it".
Since it requires the engine (with its belt-driven water pump) to be running for operation, i really don't know if it entails or requires a separate electric circulation pump. (the REST function does)
Here's the owner's manual's single page on it:
View attachment 73043
I've looked through some of the schematics in hopes I'll build up the confidence to try and hot wire this thing back into action. However, said schematics are a bit scary so far.
Maybe I'll hear back from the PO if he knows anything about my conundrum.