What are the terminal labels on the voltage regulator in this diagram?

The regulator shows four terminals labeled, from left to right: I, A, S, and F.

Which wire colors go to which regulator terminals?

A green wire goes to the I terminal, a yellow wire to the A terminal, a white/hatched wire to the S terminal, and an orange wire (marked with blue hashes) to the F terminal.

How does the regulator connect to the car's wiring?

The wires pass from the regulator through connector blocks labeled 'Adapter' into the 'Original plug from car,' which then connects to the loom back to the car.

Does this diagram require cutting the original harness?

The diagram shows an adapter placed between the regulator and the original plug from the car, indicating the factory plug is retained and connected via the adapter.

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Ford Voltage Regulator Wiring Diagram - I A S F Terminals with Adapter Plug

Wiring diagram of voltage regulator connector through an adapter to the original car plug

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Wiring diagram showing voltage regulator pins I/A/S/F routed via an adapter to the original car plug with color-coded wires.

AI caption October 2014 · Photo 575 of 894

This document is a simple hand-drawn wiring diagram showing how to connect a voltage regulator to a vehicle's original wiring harness using an adapter. The regulator at the top has four terminals labeled I, A, S, and F. Four color-coded wires run from these terminals: a green wire from I, a yellow wire from A, a white/hatched wire from S, and an orange wire (marked with blue hashes) from F. These wires pass through two stacked connector blocks that are collectively labeled 'Adapter,' then continue down to a block labeled 'Original plug from car.' Below that, two lines represent the wiring 'Loom back to car.' A reader can learn the terminal order on the regulator (I-A-S-F), which wire color corresponds to which terminal, and that an adapter is used between the regulator plug and the vehicle's original connector rather than splicing directly into the harness. The diagram contains no fuse information, part numbers, torque values, year designations, or model applicability statements — it is purely a pin-to-pin/color routing illustration. It was uploaded to the gallery of a 1976 Ford Ranchero, and nothing in the drawing contradicts that application.

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Frequently asked questions

What are the terminal labels on the voltage regulator in this diagram?: The regulator shows four terminals labeled, from left to right: I, A, S, and F.
Which wire colors go to which regulator terminals?: A green wire goes to the I terminal, a yellow wire to the A terminal, a white/hatched wire to the S terminal, and an orange wire (marked with blue hashes) to the F terminal.
How does the regulator connect to the car's wiring?: The wires pass from the regulator through connector blocks labeled 'Adapter' into the 'Original plug from car,' which then connects to the loom back to the car.
Does this diagram require cutting the original harness?: The diagram shows an adapter placed between the regulator and the original plug from the car, indicating the factory plug is retained and connected via the adapter.