The 1998 T800 electrical system uses terminal strips and spare circuits to allow for adding options. Specific relays identified in service manuals include:
: Power for the trailer ABS is traced from the fuse panel or a relay box near the battery. Maintenance & Troubleshooting Tips 1998-kenworth-t800-fuse-panel-diagram
: Many electrical failures on this model are traced to broken or loose ground wires, which are typically white in Kenworth schematics. The 1998 T800 electrical system uses terminal strips