What engines does this ignition wiring diagram cover?

The diagram is labeled for 5.0L and 5.8L engines.

What wire color feeds ignition power to the TFI module and coil?

Circuit 16 R/LG (red/light green) runs from the ignition switch through splices S206, S126, and S199 to the TFI ignition module (C1021), the ignition coil, and the radio capacitor (C1017).

What is the SPOUT circuit wire in this diagram?

Circuit 929 PK (pink) between EEC pin 46 and the TFI ignition module, passing through connector C113/C1019 and the SPOUT test connector.

What is the part number and value of the ignition suppression resistor?

It is a 22KΩ resistor, part number E9DB-14A601-FA, connected in the 11 T/Y circuit.

Where can I find testing info for the ignition switch per this diagram?

The diagram references page 13-2 for the ignition switch and page 149-2 for switch testing; power distribution is also on page 13-2.

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Ford 5.0L & 5.8L TFI Ignition System Wiring Diagram - EEC, Coil, SPOUT Circuit

Ford 5.0L and 5.8L ignition system wiring diagram with EEC module, TFI module, color-coded wires and connector IDs

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Wiring diagram of the Ford 5.0L/5.8L electronic engine control and ignition circuit with color-coded wires and connector labels.

AI caption March 2025 · Photo 2 of 5

This document is a Ford factory-style wiring schematic for the ignition system on 5.0L and 5.8L engines, filed as a wiring diagram for a 1991 Ford F-150. It shows the TFI (Thick Film Ignition) ignition system circuit, including the ignition switch (hot at all times, with ACC/LOCK/OFF/RUN/START positions), the Electronic Engine Control (EEC) module, the TFI ignition module and its shielded wiring, the SPOUT test connector, distributor, coil wire, ignition coil, radio capacitor, EEC power relay, ignition suppression resistor (22KΩ, part E9DB-14A601-FA), instrument cluster feed, and starting system connection. Wire circuits are identified by number and color: 16 R/LG (ignition power feed through splices S206, S126, S199), 262 BR/PK, 57 BK (ground G104), 48, 395 GY/O, 259 O/R, 929 PK (SPOUT), 11 T/Y and DG/Y (tach/coil circuit), 648 W/PK, and 32 R/LB. Connectors shown include C185, C269, C250, C202, C106, C113, C179, C1008, C1017, C1019, and C1021. Cross-references point to related manual pages: ignition switch (13-2, 149-2), power distribution (13-2), EEC module (23-4), EEC power relay (24-1), starting system (20-2), and instrument cluster (60-1, 61-1). Useful for diagnosing no-spark, TFI module, and SPOUT circuit issues.

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Frequently asked questions

What engines does this ignition wiring diagram cover?: The diagram is labeled for 5.0L and 5.8L engines.
What wire color feeds ignition power to the TFI module and coil?: Circuit 16 R/LG (red/light green) runs from the ignition switch through splices S206, S126, and S199 to the TFI ignition module (C1021), the ignition coil, and the radio capacitor (C1017).
What is the SPOUT circuit wire in this diagram?: Circuit 929 PK (pink) between EEC pin 46 and the TFI ignition module, passing through connector C113/C1019 and the SPOUT test connector.
What is the part number and value of the ignition suppression resistor?: It is a 22KΩ resistor, part number E9DB-14A601-FA, connected in the 11 T/Y circuit.
Where can I find testing info for the ignition switch per this diagram?: The diagram references page 13-2 for the ignition switch and page 149-2 for switch testing; power distribution is also on page 13-2.