What positions are shown on the ignition switch symbol?

The ignition switch symbol shows five positions: Start, Run, Off, Lock, and Accy.

What sensor symbols are included in this wiring symbols chart?

The chart includes symbols for a knock sensor, a speed sensor, and two variants of the heated exhaust gas oxygen sensor.

How are relays and switches represented?

The chart shows two relay symbol variants (a switch contact with a coil, one drawn with a dashed link), plus normally open switches, normally closed switches, and a 3-position switch.

Does this document list fuse amperage ratings or wire colors?

No. It is only a legend of schematic symbols (fuse, fuse link, circuit breaker, etc.) and contains no amperage ratings, wire colors, or fuse positions.

What is a 'choice bracket' in this chart?

It is shown as a curly-bracket symbol labeled 'CHOICE BRACKET', used in wiring diagrams to indicate alternative options; the chart only shows the symbol without further explanation.

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Automotive Wiring Diagram Symbols Legend - Ford Bronco Schematic Key

Wiring diagram symbols legend — breaker, fuse, relay, switch, sensor and oxygen sensor schematic icons

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Reference sheet of wiring-diagram symbols: circuit breaker, fuse, fuse link, ground, splice, capacitor, diode, solenoid, relays, switches, resistors, sensors, bulbs, O2 sensor.

AI caption October 2005 · Photo 157 of 277

This document is a legend/reference chart titled "Wiring Diagram Symbols" that identifies the schematic symbols used in automotive wiring diagrams. It presents labeled graphical symbols in four rows. The first row covers protection and basic components: circuit breaker, fuse, fuse link, ground, splices, capacitor, diode, two solenoid symbol variants, knock sensor, and an ignition switch symbol showing its five positions (Start, Run, Off, Lock, Accy). The second row shows switch and relay symbols: normally open and normally closed switches (two variants each), a 3-position switch, battery, and two relay symbol variants. The third row shows resistors and variable resistors (two styles each), a speed sensor, a "choice bracket" symbol, and a motor. The fourth row shows two bulb symbol variants, an LED, two heating element variants, and two heated exhaust gas oxygen sensor (HEGO) symbol variants. The chart lets a reader decode any symbol encountered while reading factory wiring diagrams, such as those for a Ford Bronco. It contains no fuse ratings, wire colors, part numbers, or vehicle-specific data — it is purely a symbol key intended to accompany a set of wiring diagrams.

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Frequently asked questions

What positions are shown on the ignition switch symbol?: The ignition switch symbol shows five positions: Start, Run, Off, Lock, and Accy.
What sensor symbols are included in this wiring symbols chart?: The chart includes symbols for a knock sensor, a speed sensor, and two variants of the heated exhaust gas oxygen sensor.
How are relays and switches represented?: The chart shows two relay symbol variants (a switch contact with a coil, one drawn with a dashed link), plus normally open switches, normally closed switches, and a 3-position switch.
Does this document list fuse amperage ratings or wire colors?: No. It is only a legend of schematic symbols (fuse, fuse link, circuit breaker, etc.) and contains no amperage ratings, wire colors, or fuse positions.
What is a 'choice bracket' in this chart?: It is shown as a curly-bracket symbol labeled 'CHOICE BRACKET', used in wiring diagrams to indicate alternative options; the chart only shows the symbol without further explanation.