What resistance should the ignition resistance wire show on a 1979 Bronco?

The diagram notes a resistance of 1.05 to 1.15 ohms on the 16 R-GR resistance wire in the ignition circuit, and 8 to 9 ohms on the 30 BK-GR circuit feeding the alternator warning lamp circuit.

Which engines does the starter motor wiring in this diagram apply to?

The starter motor is labeled for the 300, 302, 351 & 400 engines, and the breakerless distributor shown is for the 8-cylinder 351/400 engines.

What are the ignition switch positions shown on the 1979 Bronco diagram?

The ignition switch positions are S-Start, R-Run, O-Off, and A-Accy.

What wire colors run to the breakerless ignition modulator?

The breakerless ignition modulator connects via wires 734 O-Y (orange-yellow), 733 BK-GR (black-green), 735 P-BL (purple-blue), 232 GR-Y, 262 BR, 32 R-BL, and 732 W.

What components are covered in the instrument cluster portion (Fig. 10.136)?

Fig. 10.136 shows the ignition switch, dual brake warning indicator lamp and switch, oil pressure warning lamp and switch, alternator warning indicator lamp, fuel gauge and sender, water temperature gauge and sender, radio receiver suppression choke, and the instrument cluster voltage regulator (C/V unit).

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1979 Ford Bronco Wiring Diagram - Ignition, Starter & Instrument Gauges

1978-1979 Ford Bronco Wiring Diagram (Haynes Fig. 10.135)

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Haynes Bronco wiring schematic (continued) showing connector S-201/S-202, fuse-link runs and transmission/instrument circuits with wire colors.

AI caption May 2007 · Photo 101 of 126

This is page 264 from a Haynes repair manual showing two continued sections of the factory-style wiring diagram for the 1979 Ford Bronco (Fig. 10.135 and Fig. 10.136). The upper diagram (Fig. 10.135) covers the starting and ignition systems: the 12-volt battery, starter motor relay, starter motor (labeled for 300, 302, 351 & 400 engines), auxiliary 12-volt battery, accessory safety relay, the 8-cylinder 351/400 breakerless distributor, ignition coil, breakerless ignition modulator, radio ignition interference capacitor, transmission gear shift neutral switch, and ammeter, with fuse links and wire circuit numbers/colors (e.g., 37 BK-Y, 38 BK-R, 32 R-BL, 16 R-GR, 526 BK-W). The lower diagram (Fig. 10.136) covers the instrument cluster and warning circuits: ignition switch (positions S-Start, R-Run, O-Off, A-Accy), dual brake warning indicator lamp and switch, oil pressure warning lamp and switch, alternator warning indicator lamp, fuel gauge and fuel gauge sender, water temperature gauge and sender, radio receiver suppression choke, and instrument cluster voltage regulator (C/V unit). Connector numbers (C-2xx, C-3xx, C-1xxx series), splices (S-xxx), grounds (G-203, G-1201), fuses (F-3, F-5, F-10), and resistance specs (1.05 to 1.15 ohms; 8 to 9 ohms) are shown, with distinctions between 'with gages' and 'without gages' configurations.

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Frequently asked questions

What resistance should the ignition resistance wire show on a 1979 Bronco?: The diagram notes a resistance of 1.05 to 1.15 ohms on the 16 R-GR resistance wire in the ignition circuit, and 8 to 9 ohms on the 30 BK-GR circuit feeding the alternator warning lamp circuit.
Which engines does the starter motor wiring in this diagram apply to?: The starter motor is labeled for the 300, 302, 351 & 400 engines, and the breakerless distributor shown is for the 8-cylinder 351/400 engines.
What are the ignition switch positions shown on the 1979 Bronco diagram?: The ignition switch positions are S-Start, R-Run, O-Off, and A-Accy.
What wire colors run to the breakerless ignition modulator?: The breakerless ignition modulator connects via wires 734 O-Y (orange-yellow), 733 BK-GR (black-green), 735 P-BL (purple-blue), 232 GR-Y, 262 BR, 32 R-BL, and 732 W.
What components are covered in the instrument cluster portion (Fig. 10.136)?: Fig. 10.136 shows the ignition switch, dual brake warning indicator lamp and switch, oil pressure warning lamp and switch, alternator warning indicator lamp, fuel gauge and sender, water temperature gauge and sender, radio receiver suppression choke, and the instrument cluster voltage regulator (C/V unit).