6 volt wiring technican

An older Cushman One Passanger Industrial Electrical Vehicle needs battery wiring. It has 4 new 6 volt batteries and a couple of wiring drawings but at one time a new foot pedal was installed so none of the dwawings seem to work. It is going to take a real expert to get it working and for a real expert it will be a walk in the park. In order to get paid you need to get it working without causing any damage to the unit. so if you do not know what you are doing do not apply. Also you need to come to where it is to work on it.