What engines does this start/ignition wiring diagram cover?

The page header states it covers the 5.0L, 5.8L, and 7.5L engines.

What wire feeds the starter relay from the ignition switch?

Circuit 32 R/LB (red/light blue) runs from the ignition switch ST terminal through connectors C114 and splice S121 to the starter relay.

What size and color is Fuse Link M?

Fuse Link M is 18 gauge brown, feeding circuit 37 (yellow) to the ignition switch BATT terminals via C100 and S208.

What are the wire colors at the EEC distributor TFI module?

The TFI module connects to the EEC via 259 BK/O, 349 DB, and 324 Y/LG, with 20 W/LB, 11 DG/Y, and 32 R/LB feeds shown.

What resistor values are used in the tachometer/EEC ignition circuit?

A 1.8 K ohm and a 22 K ohm resistor are shown, with 648 R/LB going to the tachometer (page 88) and 11 DG/Y to the electronic engine control (page 41).

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1989 Ford Bronco Start/Ignition Wiring Diagram 5.0L 5.8L 7.5L - TFI & Coil

Start/Ignition wiring diagram page 28 for 5.0L 5.8L 7.5L with ignition switch and starter circuits

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Wiring diagram of the start/ignition system showing ignition switch terminals, starter relay, TFI module, and charge circuits.

AI caption February 2011 · Photo 460 of 1799

This is page 28 of a Ford factory-style wiring diagram set covering the START/IGNITION system for 5.0L, 5.8L, and 7.5L gasoline engines. The diagram traces power from Fuse Link M (18 GA brown) through connector C100 and splice S208 to the ignition switch BATT terminals, showing switch positions (LOCK, OFF, RUN, ACCY, START) and terminal outputs: circuit 32 R/LB to the starter (ST), 16 R/LG (I1), 687 GY/Y (A2), and 262 BR/PK (I2). It shows the starter relay, battery, starter motor, and radio noise capacitor circuits, plus grounds G203 and circuits 57 BK, 60 BK/LG, and 397 BK/W. The instrument cluster charge indicator lamp circuit (16 R/LG in, 904 LG/R out via C208B and C100) is detailed. Ignition coil BATT/TACH wiring (20 W/LB, 11 DG/Y), the EEC distributor TFI module with outputs 259 BK/O, 349 DB, and 324 Y/LG to the EEC, resistor network (1.8K and 22K ohm) feeding the tachometer (648 R/LB) and EEC (11 DG/Y), and Fuse Link D (20 GA green-blue) are all shown. Cross-references point to related pages: charge/power distribution (17), fuse panel (16), grounds (12), fuel injector cooling fan (52), EEC (36, 41), tachometer (88), ERBP (80), and switch terminals (142).

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Frequently asked questions

What engines does this start/ignition wiring diagram cover?: The page header states it covers the 5.0L, 5.8L, and 7.5L engines.
What wire feeds the starter relay from the ignition switch?: Circuit 32 R/LB (red/light blue) runs from the ignition switch ST terminal through connectors C114 and splice S121 to the starter relay.
What size and color is Fuse Link M?: Fuse Link M is 18 gauge brown, feeding circuit 37 (yellow) to the ignition switch BATT terminals via C100 and S208.
What are the wire colors at the EEC distributor TFI module?: The TFI module connects to the EEC via 259 BK/O, 349 DB, and 324 Y/LG, with 20 W/LB, 11 DG/Y, and 32 R/LB feeds shown.
What resistor values are used in the tachometer/EEC ignition circuit?: A 1.8 K ohm and a 22 K ohm resistor are shown, with 648 R/LB going to the tachometer (page 88) and 11 DG/Y to the electronic engine control (page 41).