Electrical 2008 Avalon Pontoon

[DoodleBob]

Have 2 wires that go to the battery (not main power positive & negative) that are both black and no indication if they should be positive or negative? Any help?

 

[Alumarine]

Have 2 wires that go to the battery (not main power positive & negative) that are both black and no indication if they should be positive or negative? Any help?

Welcome.
I'm afraid you're going to have to follow them to see where they go.