What wire color goes from the ignition switch to the starter relay?

The starter relay and distributor circuits are shown on RED-LT BLU wires, fed from the ignition switch ST terminal (RED-LT BLU) through the clutch interlock switch (M/T) or neutral safety switch (A/T).

What are the ignition switch connector pins and wire colors?

A2 = GRY-YEL, ST = RED-LT BLU, I1 = RED-LT GRN, A1 = BLK-LT GRN, I2 = BRN-PNK, and P2 (shown feeding a DIESEL branch).

What ignition switch positions are shown in the diagram?

The switch detail shows ACCY, LOCK, OFF, RUN, and START positions across the internal contacts.

How does battery power reach the ignition switch?

Through a BRN fusible link and a BLU fusible link on YEL wires passing through connector C100.

What fuses appear in this diagram?

Fuse #1 (15A), fed via the hazard flasher circuit on a RED-WHT wire, and fuse #4 (15A) on a TAN-WHT wire.

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Ford Bronco Ignition Switch & Starter Relay Wiring Diagram - Wire Colors, C100

Bronco ignition and starter wiring diagram with color-coded wires and ignition switch positions

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Wiring diagram showing ignition switch, starter relay and related circuits with color-coded wire labels.

AI caption October 2006 · Photo 773 of 990

This document is a screen capture (Adobe Reader 7.0) of one page of a Ford truck ignition switch and starting-circuit wiring diagram, spanning schematic grid columns 16–18, rows A–B. It shows the starter relay and distributor feeds (RED-LT BLU), the clutch interlock switch used with manual transmissions (M/T), and the neutral safety/transmission range switch (positions P, R, N, D, 2, 1) for automatic transmissions (A/T). The ignition switch internal contact detail is drawn with positions ACCY, LOCK, OFF, RUN, and START, and its connector pins are labeled A2 (GRY-YEL), ST (RED-LT BLU), I1 (RED-LT GRN), A1 (BLK-LT GRN), I2 (BRN-PNK), and P2. Power comes in through BRN and BLU fusible links via connector C100 on YEL wires. Branch circuits are labeled for rear defog, back-up lights, electric shift control (RED-WHT/BLK-PNK), hazard flasher, HEGO sensor, injection blower relay, ECA power, instrument cluster, warning circuits, glow plugs (diesel), windshield wiper, cruise control (WHT-PPL), and tailgate window (BLK-WHT). Engine-specific branches are noted for (GAS), (DIESEL), and (4.9L). Two 15-amp fuses are shown (#1 15A and #4 15A). Wire colors are given throughout, useful for tracing starter and ignition-switch circuits.

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Frequently asked questions

What wire color goes from the ignition switch to the starter relay?: The starter relay and distributor circuits are shown on RED-LT BLU wires, fed from the ignition switch ST terminal (RED-LT BLU) through the clutch interlock switch (M/T) or neutral safety switch (A/T).
What are the ignition switch connector pins and wire colors?: A2 = GRY-YEL, ST = RED-LT BLU, I1 = RED-LT GRN, A1 = BLK-LT GRN, I2 = BRN-PNK, and P2 (shown feeding a DIESEL branch).
What ignition switch positions are shown in the diagram?: The switch detail shows ACCY, LOCK, OFF, RUN, and START positions across the internal contacts.
How does battery power reach the ignition switch?: Through a BRN fusible link and a BLU fusible link on YEL wires passing through connector C100.
What fuses appear in this diagram?: Fuse #1 (15A), fed via the hazard flasher circuit on a RED-WHT wire, and fuse #4 (15A) on a TAN-WHT wire.