Hi Scott, I didnt have the factory install scotty plugs, but did have them plug in a cigarette style 12v plug. That was incase I needed something like a frig in the stern. The 38 has limited space, so I went with a large frif/freezer where the gen set goes and it's super awesome. If I had scotty p=lugs installed, which I like better I would splice in a Scotty male for the frig.
If you interested in this, then I would look at:
Frig (Doug Alba Bella has this one) which I bought for the stern and would fit great on a 38, but I sent it back and got the big one for the basement. It's go big or go home and I like my helmsman better than my home.:
Scotty plug: