The Kenworth headlights with DRL wiring diagram, publication R115-4389, shows the head lamp circuit for T600 trucks equipped with daytime running lamps. The single-sheet schematic traces power from the battery buss bar, through the head light relay and the dimmer circuit, out to the left and right head lamp assemblies, and on to the high-beam indicator in the cab.
Circuits on the diagram — Kenworth headlights with
The print routes circuit R5HL (LT BLU) from the head light switch to the head light relay in the power distribution box, then feeds the head lamp harness through the DRL cab-section harness. High-beam circuit L7HB (BLU/WHT) and low-beam circuit L6LB (RED/BLK) run to both dual head lamp clusters, and the high-beam indicator lamp is driven off the instrument panel harness so the driver sees when high beam is selected.
Dimmer and DRL control — Kenworth headlights with
This Kenworth headlights with DRL sheet also details how beam selection and the daytime running function are controlled through several devices working together:
- Dimmer switch in the turn signal switch (standard) or floor-mounted (option)
- Dimmer relay controlling beam selection
- Park brake switch input feeding the DRL logic
- Head light relay energised from the battery buss bar
The diagram notes that single head lamps are wired the same as the high/low beam head lamps, so the same reference applies whether the truck has single or dual lamps.
Using the print
Start at the head light relay and confirm the R5HL feed before chasing a dead beam, then verify the ground to the main cab ground and check the dimmer relay operation. Because it ties the switch, relay, dimmer and DRL logic together on one sheet, the headlights with DRL drawing is a complete guide to beam operation and daytime running lamp behaviour on the T600. Publication R115-4389 is a Kenworth electrical drawing; manufacturer information is at the Kenworth website. Related wiring sheets are listed in the DiagTechPro manuals library.
Applies to these truck models
This is the manufacturer document shared across 3 model families. It applies to:
- Kenworth T6
- Kenworth T8
- Kenworth W9
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