Hi Joe, I have the same boat (make, model, and year), an '87 204c Overnighter. I'm not sure exactly what our asking but here is a photo of my boat at dock with an arrow pointing to the front drain. My boat sits a little low at rest with the weight of the bigger engine. A lighter OB say an early 150 would let the boat float higher in the stern and bring those side drains closer to the water line. Either way you can see the wet line on the boat which reaches the drain.
Inside the boat the drain from the side fishbox runs forward to connect to the front floor drain with a "T" fitting then to the outer drain.
There is an access hatch down low near the deck on either side in front of both helm seats so that you can check or service those lines though you have to a contortionist to do it.
Hope this helps. Need anything more I'll try to help. Mike.
If you mean 120v AC no mine doesn't have that. You don't typically see shore power on smaller boats that arn't considered live aboards. I doubt it came from Grady that way as I just went back through a factory 1987 Grady brochure I have. The only models that even offered dock side power as an option were the 25' Trophy Pro and Sailfish models, nothing smaller. The prior owner must have set that up for shore power provided from the dock.
If it's not shore power it's possible it uses a power inverter converting 12v dc to AC. That's what you have if you get 120ac off the battery and it's not plugged into the house or dock.
I have a decent plugin unit from radio shack that powers a laptop with ease in our SUV. Never gave a thought to using it in the boat. Now I'm wondering if it would power a keurig coffee maker. planning to do some overnight catfishing trips on the Delaware this year. It'd be nice to have coffee in the morning.
Mike