John Deere – 1023E, 1025R and 1026R – Lighting Circuit – 1023E

Lighting Circuit Function
To energize the lighting system in individual, or combined circuits.

Lighting Circuit Operating Conditions
– Key switch in OFF or ON position
– All lights except turn signals (See Turn Lights Operation below.)

Headlight Operation
A dedicated fuse provides unswitched battery current to the light switch. Moving the light switch to either the Road or Field position makes this power available to the headlights. A separate fuse protects the headlight circuit wiring.

Marker Lights Operation
The same light switch connection that provides power for the headlight circuit also powers the marker lights. A separate fuse protects the marker lights wiring.

Hazard Lights Operation
Both the Hazard and Road positions of the light switch activate a single input on the control cluster. The cluster powers up (without regard to the key switch) and simultaneously flash the outputs for the left and right turn signal lights. The display panel turn signal indicators flash in unison with the turn signal outputs.

Turn Lights Operation
The turn signal switch common terminal is wired into the machine’s switched power circuit.
Moving the switch to the RIGHT or LEFT position lets the switch send a positive signal to the corresponding input of the control cluster. Logic in the cluster flashes the output of the selected turn signal light and keeps ON the opposite turn light. The display panel turn signal indicators flash in unison with the respective turn signal outputs.

Turn signal switch inputs override the hazard input when the key switch is ON.

Work Lights Operation
Machine lighting varies according to model. Work lights and fender lights are standard on deluxe machines. Base-level machines require an optional wiring kit that allows up to two work lights to be installed.

A light switch contact, made active in the Field position, is the power source for the work lights. The work lights connect to this power via the wiring circuit fuse.