1990 Gmc Fuel Pump Wiring Diagram - Types of RV Batteries. Batteries used to power the coach in an RV must be a deep-cycle design to withstand the frequent and deep discharges and recharging they typically receive.. The core of GM Security Systems is the engine immobilizer. It goes by many different names, like Passkey, VATS or Passlock etc. depending on the car manufacturer that is installing them and on a number of small variants..