What fuse link powers the ignition switch on the 4-cylinder turbo start/ignition circuit?

Fuse Link C, a 16 GA black link (hot at all times, see page 10), feeds circuit 37 Y through connector C201 and splice S105 to the ignition switch BATT terminals.

What wire color and circuit number is the starter relay trigger wire?

Circuit 32, red/light blue (R/LB), runs from the ignition switch START position through C107, C350, C201, and the clutch safety switch (manual transmission only) to the starter relay.

What protects the ignition run circuit to the TFI module and coil?

Fuse Link N, a 20 GA blue link, fed by circuit 262 BR/PK from ignition switch terminal I2 through C201, then continuing as circuit 16 R/LG through C112 and S143 to the ignition coil BATT terminal and TFI ignition module.

What resistor is in the tachometer signal circuit?

A 22K-ohm resistor is shown in circuit 11 DG/Y D between ECA pin 4 and the tach signal line that runs through C135 and C210 to the tachometer (see page 14).

Which ECA pins connect to the TFI ignition module?

Pin 56 via circuit 349 DG, pin 36 via circuit 324 Y/LG D (through C275), and pin 16 via circuit 259 BK/O; pins 40 and 60 are grounds (57 BK).

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1986 Ford Mustang SVO 2.3 Turbo Start/Ignition Wiring Diagram - TFI, ECA, Coil

Start/ignition wiring diagram for 4-cylinder turbo engine with color-coded circuits

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Wiring diagram of the start and ignition system for a 4-cylinder turbo, showing the ignition switch, starter relay, and ECA with color-coded wires.

AI caption April 2012 · Photo 8 of 54

This is page 99 of a Ford factory-style electrical/vacuum troubleshooting manual, showing the complete Start/Ignition wiring diagram for the 4-cylinder turbo engine. The diagram traces power from Fuse Link C (16 GA black, hot at all times) through splice S105 and connector C201 to the ignition switch BATT terminals. It shows the start circuit (circuit 32 R/LB) running through connectors C107, C350 and C201, the clutch safety switch (manual transmission only), and the starter relay to the starter motor and battery. The run circuit (16 R/LG) feeds the alternator warning indicator, charge/power distribution, Fuse Link N (20 GA blue via 262 BR/PK), the TFI ignition module, and the ignition coil BATT terminal. The Electronic Control Assembly (ECA) connects to the TFI module via circuits 349 DG (pin 56), 324 Y/LG D (pin 36 via C275) and 259 BK/O (pin 16), with a 22K-ohm resistor in circuit 11 DG/Y D feeding the tachometer signal through C135 and C210. Grounds run through 57 BK wires to splice S147, connector C149, G122 (frame) and G101 (engine). Cross-references point to pages 10, 11, 14, 47B, 80 and 112 for related circuits.

This document covers 1986, which may differ from this 1978 Ford Bronco.

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Frequently asked questions

What fuse link powers the ignition switch on the 4-cylinder turbo start/ignition circuit?: Fuse Link C, a 16 GA black link (hot at all times, see page 10), feeds circuit 37 Y through connector C201 and splice S105 to the ignition switch BATT terminals.
What wire color and circuit number is the starter relay trigger wire?: Circuit 32, red/light blue (R/LB), runs from the ignition switch START position through C107, C350, C201, and the clutch safety switch (manual transmission only) to the starter relay.
What protects the ignition run circuit to the TFI module and coil?: Fuse Link N, a 20 GA blue link, fed by circuit 262 BR/PK from ignition switch terminal I2 through C201, then continuing as circuit 16 R/LG through C112 and S143 to the ignition coil BATT terminal and TFI ignition module.
What resistor is in the tachometer signal circuit?: A 22K-ohm resistor is shown in circuit 11 DG/Y D between ECA pin 4 and the tach signal line that runs through C135 and C210 to the tachometer (see page 14).
Which ECA pins connect to the TFI ignition module?: Pin 56 via circuit 349 DG, pin 36 via circuit 324 Y/LG D (through C275), and pin 16 via circuit 259 BK/O; pins 40 and 60 are grounds (57 BK).