Evader wiring

Call me stupid, call me a simpleton, all I really need is a simple diagram that shows how to re wire new batteries in my Evader 1000. When I opened it up, the wires fell off the charger plug in the scooder and there are a couple of other wires I'm afraid to connect. All I know is that it's 4 12v batteries in series.
Help for dummies!!
Thanks!
nsheridan [at] charter.net