Jake
You don't need and will not see extra wires to the battery with a charger. In most cases, the wires leaving the battery will go to a switch that can turn the battery off so to speak (disconnect to from the grid). The other wire on that switch will go to a bus bar (that's how it's connected to the grid). The charger would be attached to the bus bar. Why? Because electric current flows though the entire grid and when it's not being used, it heads to the battery. Note: if the battery is at full charge and the charger is still sending current, then the battery starts to cook, but smart chargers can determine this and stop charging.How can you tell if you have a charger? Besides looking all over the place for a metal box with wires to it, take a multi-meter (you got to get one if you don't have one) and check the volts at the battery (or just look at your guage if you have one). If you have a charger and it's working, there should be at least 13 volts when you turn a lot of stuff on.My advice, find that bus bar and find out what every wire is. Later on you just may need to know this so it's a good idea to get a head start.