...How do I make sure Red goes to positive and black goes to negative BEFORE I hook it up!
The bus has a red and a black cable for each battery. Batteries are on a rack on top of each other aft of the fuel tank. All 4 cables bolt to the wall in the battery area. There is a disconnect in the RH fwd baggage compartment fwd wall. How do I make sure Red goes to positive and black goes to negative BEFORE I hook it up!