Periodically inspect electrical connectors on the outside of the cab and on the engine and frame for corrosion and tightness. Exposed terminals, such as the fuel sender, cranking motor, alternator and feed-through studs, should be cleaned and re-coated with a lubricant sealing grease such as Motorcraft Silicone Brake Caliper Grease and Dielectric Compound XG-3, or equivalent. This should include the ground cable connector for batteries, engine and cab as well as the jump-starting stud.

Vehicle electrical systems are complex and often include powertrain components, such as engine and transmission controls, instrument panels and ABS. While most systems operate on battery voltage (12 volts), some systems can be as high as 90 volts or as low as five volts. See the Electrical Circuit Diagram Manuals, available from your vehicle’s manufacturer, to make sure that any extra body lights and accessory connections to circuits are both appropriate and not overloaded. Do not make modifications to any vehicle control system without first contacting an authorized dealer.