What are the two alternator charging system configurations shown?

Figure 1 shows the alternator charging system with a charge indicator light (J1210-1M), and Figure 2 shows the system with an ammeter (J1205-1L).

What resistor is used with the charge indicator light?

A 500-ohm resistor is shown connected across the charge indicator light in Figure 1.

What terminals are on the alternator and regulator in these diagrams?

The alternator has BAT. (output), STA. (stator), and FLD. (field) terminals; the regulator terminals shown are I, A+, S, and F (Figure 2 uses A+, S, F, with one terminal marked not used with ammeter).

Where does the electric choke heater get its power?

The electric choke heater is fed by the orange/light blue wire from the alternator's stator (STA.) terminal in both diagrams.

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Ford Alternator Charging System Wiring Diagram - Indicator Light & Ammeter

Alternator charging system wiring diagrams with color-coded wires and labeled terminals

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Wiring diagrams of the alternator charging system (indicator-light and ammeter versions) with color-coded wires and terminal labels.

AI caption January 2014 · Photo 174 of 363

This scanned page from a Ford service manual presents two alternator charging system wiring diagrams. Figure 1 (drawing J1210-1M) shows the alternator charging system with a charge indicator light, and Figure 2 (drawing J1205-1L) shows the alternator charging system with an ammeter. Both diagrams identify the internal alternator components — diode rectifiers, stator windings, rotating field, and slip rings — along with the external terminals BAT., STA. (stator), and FLD. (field), and voltage regulator terminals I/A+/S/F. Wiring details include the fuse link and black-orange fuse link at the battery terminal of the starter relay, a green-red stripe wire to the ignition switch, a yellow-white dot wire at the alternator output, a white-black stripe wire, an orange/light blue wire from the stator terminal to the electric choke heater, and a 500-ohm resistor across the charge indicator light. The ammeter version notes a shunt-type ammeter connection and marks one regulator terminal as "not used with ammeter." A reader can learn the wire color codes, terminal identification, and circuit routing needed to diagnose or rewire a Ford alternator charging system in either indicator-light or ammeter configurations. Faint tabular text (apparently a battery specific-gravity/charging table) bleeds through behind the right diagram but is mostly illegible.

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Frequently asked questions

What are the two alternator charging system configurations shown?: Figure 1 shows the alternator charging system with a charge indicator light (J1210-1M), and Figure 2 shows the system with an ammeter (J1205-1L).
What wire colors are used in the Ford alternator charging circuit?: The diagrams label a black-orange fuse link, a green-red stripe wire to the ignition switch, a yellow-white dot wire at the alternator output, a white-black stripe wire, and an orange/light blue wire running to the electric choke heater.
What resistor is used with the charge indicator light?: A 500-ohm resistor is shown connected across the charge indicator light in Figure 1.
What terminals are on the alternator and regulator in these diagrams?: The alternator has BAT. (output), STA. (stator), and FLD. (field) terminals; the regulator terminals shown are I, A+, S, and F (Figure 2 uses A+, S, F, with one terminal marked not used with ammeter).
Where does the electric choke heater get its power?: The electric choke heater is fed by the orange/light blue wire from the alternator's stator (STA.) terminal in both diagrams.