What wire colors are used in the Ford 2G alternator wiring?

The diagram shows B/O (black/orange) from the alternator B+ output, Y/W (yellow/white) to the regulator A terminal, W/BK (white/black) from the stator to the S terminal, and LG/R (light green/red) from the I terminal to the Hot-in-Run circuit.

What fuse protects the 2G alternator's indicator circuit?

The LG/R indicator wire runs to a 'Hot in Run' circuit protected by a 20A fuse.

How is the 2G alternator output connected to the battery?

The B+ output goes through a B/O wire and a 12-gauge fuse link on a red wire to the battery positive terminal.

What is the resistor value across the charge lamp?

A 510-ohm resistor is shown in parallel with the optional instrument cluster charge lamp.

What terminals does the 2G regulator have?

The internal regulator is shown with A, S, and I terminals: A receives the Y/W sensing wire, S receives the W/BK stator wire, and I connects via LG/R to the charge lamp/Hot-in-Run circuit.

Home/ Registry/ Ford/ F-150/ 1975-1979/ 1979 Ford F-150/ Photo supermotors.net/registry/media/1129826

Ford 2G Alternator Wiring Diagram - Regulator Terminals, Wire Colors & Fuses

2G alternator wiring diagram with fuse link, battery, internal regulator and charge lamp

‹ ›

Reference · 1975-1979 F-150All 10 wiring diagrams

Ford 2G Alternator Wiring Diagram - Regulator Terminals, Wire Colors & Fuses

Ford 3G Alternator Wiring Diagram - Mega Fuse, Regulator & Charge Lamp Circuit

Ford F-150 Charging & Starting Wiring Diagram (With Gauges) - Ammeter, Alternator

Ford Power Window Wiring Diagram - Dash & Key Switch, Motor Wire Colors

Hand-Drawn 120V 3-Way Switch & Light Box Wiring Diagram Sketch

Hand-Drawn 3-Way Switch Wiring Diagram - 120V Stairway Light Circuit Sketch

Hand-Drawn 3-Way Switch Wiring Diagram - 120V Light Circuit with Two Switch Boxes

3-Way Switch Light Circuit Hand-Drawn Wiring Diagram - Travelers, 120V Hot, Neutral

Auto-Dimming Inside Rearview Mirror Wiring Diagram - Temp Sensor & Backup Lamp

1978 Ford F-150 Alternator & Voltage Regulator Wiring Diagram - Wire Colors

10wiring diagrams1975-1979 Ford F-150 More reference

Brochure

Ford Model A Show Car Placard - Bob Leach, Tucker GA - 200ci 40HP, $395 New

Spec plate

Ford NP435 4-Speed Transmission Exploded View Diagram - Shop Manual Page 21-14

Exploded parts

Spicer V-Drive Independent Front Suspension Axle Maintenance Manual Cover

Manual page

Schematic

Honda Prelude 2.1L Vacuum Hose Routing Diagram Decal - 17277-PK3-A01

Vacuum routing

Ford Steering Column Removal & Installation - Shift Rod Within Tube (Econoline)

Service procedure

Ford F150 Brake Upgrade Calculations - F350 MC & Thunderbird Caliper Comparison

Torque spec

color-coded wiring diagram of a Ford 2G alternator charging circuit with fuse link, internal regulator and instrument-cluster charge lamp.

Part of 1975-1979 Ford F-150 Wiring Diagrams

AI caption March 2018 · Photo 2948 of 2962

This is a color-coded wiring diagram for the Ford 2G alternator charging system, produced by RJM Injection Tech (copyright 2005). It shows the internal layout of the 2G alternator, including the stator, rectifier (spelled 'RECTFIER' in the diagram), and the internal regulator with its sensing and switching circuits and field winding, along with the regulator's A, S, and I terminals. Externally, the diagram traces the charging circuit: the alternator B+ output runs through a black/orange (B/O) wire and a 12-gauge fuse link to the battery positive terminal. A yellow/white (Y/W) sensing wire connects the fuse-link/battery junction to the regulator's A terminal, and a white/black (W/BK) stator wire feeds the S terminal. The regulator's I (indicator) terminal connects via a light green/red (LG/R) wire through a 20A 'Hot in Run' fused circuit, with an optional instrument cluster charge lamp shown in a dashed box, paralleled by a 510-ohm resistor. Readers can use this diagram to identify wire colors, terminal functions, and fuse/fuse-link locations when wiring, retrofitting, or troubleshooting a Ford 2G alternator installation.

Is this accurate? Sign in to help verify it.

Frequently asked questions

What wire colors are used in the Ford 2G alternator wiring?: The diagram shows B/O (black/orange) from the alternator B+ output, Y/W (yellow/white) to the regulator A terminal, W/BK (white/black) from the stator to the S terminal, and LG/R (light green/red) from the I terminal to the Hot-in-Run circuit.
What fuse protects the 2G alternator's indicator circuit?: The LG/R indicator wire runs to a 'Hot in Run' circuit protected by a 20A fuse.
How is the 2G alternator output connected to the battery?: The B+ output goes through a B/O wire and a 12-gauge fuse link on a red wire to the battery positive terminal.
What is the resistor value across the charge lamp?: A 510-ohm resistor is shown in parallel with the optional instrument cluster charge lamp.
What terminals does the 2G regulator have?: The internal regulator is shown with A, S, and I terminals: A receives the Y/W sensing wire, S receives the W/BK stator wire, and I connects via LG/R to the charge lamp/Hot-in-Run circuit.