What is the difference between the two alternator charging system diagrams shown?

Figure 1 shows the alternator charging system with a charge indicator light (with a 500-ohm resistor across it), while Figure 2 shows the system used with an ammeter, including a connection used with a shunt-type ammeter and one marked 'not used with ammeter.'

What resistor value is used with the charge indicator light?

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

What wire colors are identified in the charging system?

The diagrams label a green-red stripe wire, a yellow-white dot wire, a white-black stripe wire, an orange/light blue wire to the electric choke heater, and a black-orange (black/orange) fuse link.

What terminals are labeled on the alternator?

The alternator terminals shown are BAT. (alternator output terminal), STA. (stator terminal), and FLD. (field terminal); regulator-side terminals are labeled I, A+, S, and F.

Where does the charging system connect to battery power?

Both diagrams show the charging circuit connecting through a fuse link to the battery terminal of the starter relay.

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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.

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This scanned page from a Ford service reference presents two schematic wiring diagrams of the alternator charging system. Figure 1 (drawing number J1210-1M) shows the charging system as used with a charge indicator (warning) light, including the battery, fuse link, black-orange fuse link, battery terminal of the starter relay, ignition switch accessory terminal, a 500-ohm resistor across the charge indicator light, and the alternator's internal components: diode rectifiers, stator windings, rotating field, and slip rings. Terminal designations (I, A+, S, F on the regulator side; BAT., STA., FLD. on the alternator) and wire color codes are labeled, including green-red stripe, yellow-white dot, white-black stripe, and orange/light blue wiring to the electric choke heater. Figure 2 (drawing number J1205-1L) shows the same charging system as equipped with an ammeter, noting a black/orange fuselink, a connection "used with shunt type ammeter," and one "not used with ammeter," plus the ignition terminal and switch, green-red stripe wire, and identical alternator internals. A reader can use this page to trace charging-circuit wiring, identify wire colors and terminal names, and understand the differences between indicator-light and ammeter-equipped charging systems on these Ford vehicles. Some text from the reverse page bleeds through but is largely unreadable.

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Frequently asked questions

What is the difference between the two alternator charging system diagrams shown?: Figure 1 shows the alternator charging system with a charge indicator light (with a 500-ohm resistor across it), while Figure 2 shows the system used with an ammeter, including a connection used with a shunt-type ammeter and one marked 'not used with ammeter.'
What resistor value is used with the charge indicator light?: A 500-ohm resistor is shown wired across the charge indicator light in Figure 1.
What wire colors are identified in the charging system?: The diagrams label a green-red stripe wire, a yellow-white dot wire, a white-black stripe wire, an orange/light blue wire to the electric choke heater, and a black-orange (black/orange) fuse link.
What terminals are labeled on the alternator?: The alternator terminals shown are BAT. (alternator output terminal), STA. (stator terminal), and FLD. (field terminal); regulator-side terminals are labeled I, A+, S, and F.
Where does the charging system connect to battery power?: Both diagrams show the charging circuit connecting through a fuse link to the battery terminal of the starter relay.