Aftermarket (Add-on) Electrical and Vacuum Equipment

The aftermarket (add-on) electrical and vacuum equipment is defined as any equipment that is installed on a vehicle after leaving the factory that connects to the electrical or vacuum systems of the vehicle. No allowances have been made in the vehicle design for this type of equipment.

NOTE:
^ Do not attach add-on vacuum operated equipment to this vehicle. The use of add-on vacuum equipment may result in damage to vehicle components or systems.
^ Connect any add-on electrically operated equipment to the vehicle's electrical system at the battery (power and ground) in order to prevent damage to the vehicle.

The add-on electrical equipment, even when installed to these strict guidelines, may still cause the powertrain system to malfunction. This may also include any equipment which is not connected to the electrical system of the vehicle such as portable telephones and radios. Therefore, the first step in diagnosing any powertrain problem is to remove all of the aftermarket electrical connections from the vehicle. After this is done, if the problem still exists, diagnose the problem in the normal manner.