I am not certain on your model, but typically the negative terminal of the battery wires to the engine block (for high starter current), and also wires to the frame of the vehicle for a common ground though out the vehicle.
As far as the other questions, please provide more info on your vehicle, what you have tried, etc.
232 CI ,3 spd
33 x 12.5 x 15 ProComp XTerrains on
15 x 10 Black Rock Crawler Rims
2-1/2" Procomp lift & 3/8" Shackle lift
Moser One-Piece rear axles
Lock-Right Locker in front