Circuit Testing for GMC Truck TopKick C-Series (Crew) C6/C7/C8 2003

The Circuit Testing section contains the following diagnostic testing information. Using this information along with the diagnostic procedures will identify the cause of the electrical malfunction.

•	Using Connector Test Adapters

•	Probing Electrical Connectors

•	Troubleshooting with a Digital Multimeter

•	Troubleshooting with a Test Lamp

•	Using Fused Jumper Wires

•	Measuring Voltage

•	Measuring Voltage Drop

•	Measuring Frequency

•	Testing for Continuity

•	Testing for Short to Ground

•	Testing for a Short to Voltage