This position light switch controls the illumination of the tractor's marker lights from the interior cab. It completes the circuit between the battery supply and the lighting relay when toggled, allowing the operator to signal the vehicle's width in low-visibility conditions. The switch is mounted in the dashboard panel and uses the same electrical connector pattern as the original assembly, so no wiring modification is needed. A worn switch typically fails by intermittent contact, causing the marker lights to flicker or remain off. On replacement, verify that the switch detent engages fully in each position.