Reverse Polarity from Battery Charger

[Addendum1]

We have a 2006 Mainship 400. We have reverse polarity coming out of our batter charger. Does anyone know where the power cable coming into the battery charger originate from? I am unable to trace it.

 

[Bacchus]

You should have a breaker marked batty charger?

 

[psneeld]

We have a 2006 Mainship 400. We have reverse polarity coming out of our batter charger. Does anyone know where the power cable coming into the battery charger originate from? I am unable to trace it.

What test did you do to check the polarity?