The 1998 T800 electrical system uses terminal strips and spare circuits to allow for adding options. Specific relays identified in service manuals include:
: Additional relays, such as those for the ABS system or the A/C clutch, are often found behind the kick panel or lower dash panels, distinct from the main exterior fuse panel. 1998-kenworth-t800-fuse-panel-diagram
: Often grouped together; if multiple exterior lights fail simultaneously, it often indicates a loose ground or a blown main fuse in the firewall panel. The 1998 T800 electrical system uses terminal strips
: Power for the trailer ABS is traced from the fuse panel or a relay box near the battery. Maintenance & Troubleshooting Tips : Power for the trailer ABS is traced
: Many electrical failures on this model are traced to broken or loose ground wires, which are typically white in Kenworth schematics.
For detailed schematics, technicians often reference the KM815020 Pre-2001 Service Manual which covers the B-Cab power distribution boxes. Kenworth T80 or T800 fuse panel diagram needed