With a Test Lamp
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2003 GMC Yukon XL, 2003 GMC Yukon, 2003 Chevrolet Tahoe, 2003 Chevrolet Suburban, and 2003 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
- Remove the power feed (i.e. fuse, control module) from the suspect circuit.
- Disconnect the load.
- Connect 1 lead of the test lamp to battery positive voltage.
- Connect the other lead of the test lamp to 1 end of the circuit to be tested.
- If the test lamp illuminates, there is a short to ground in the circuit.