Denny, welcome to the HiLo community. I moved your post to its own thread since it really doesn't apply to a converter changeout.
Now, I don't know what you mean by "main power switch" - could it be the "Master Switch" that's inside the door that has to be in a certain position fot the top to raise? (And that switches power between the raising motor and the interior trailer accessories?) If so, that's just a SPDT switch and you would connect the wire to a pole that is missing a wire.
Now, here's a link to the owner's manual for the 1997 TowLite:
https://www.hilotrailerforum.com/f49...-towlite-1728/ It contains an electrical diagram and because HiLo made very few changes each year, it should be what you need.
There are several threads on changing the converter. You posted in one of them. If you need mine, here it is:
https://www.hilotrailerforum.com/f28...lacement-7659/
- Jack
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