How does the 3G alternator output connect to the battery?

The alternator's B+ output terminal connects to the battery positive through a MEGA FUSE, shown as a red wire in the diagram.

What wire colors are used on the 3G alternator regulator plug?

The diagram shows W/BK (white/black) for the stator wire, Y/W (yellow/white) for the sense wire to the battery/mega fuse side, and LG/R (light green/red) for the indicator wire to the charge lamp circuit.

How is the charge indicator lamp circuit wired?

The LG/R indicator wire runs from the regulator's I terminal to a 'Hot in Run' 20A fuse, passing through an optional instrument cluster charge lamp that is paralleled with a 510-ohm resistor.

What fuse protects the alternator indicator circuit?

A 20A fuse on a 'Hot in Run' circuit feeds the indicator/charge lamp wire.

What internal components of the 3G alternator are shown?

The diagram shows the stator, rectifier, and the regulator containing sensing and switching circuits plus the field winding, with regulator terminals labeled S, A, and I.

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

3G alternator charging wiring diagram with mega fuse, battery, regulator and optional instrument cluster charge lamp

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Wiring diagram for a 3G alternator charging circuit showing the mega fuse, battery, voltage regulator, and optional cluster charge lamp.

AI caption November 2011 · Photo 1038 of 2216

This document is a color wiring diagram for the Ford 3G alternator charging system. It shows the alternator internals (stator, rectifier bridge, and internal regulator with sensing and switching circuits and field winding) and how the unit connects to the vehicle's electrical system. The alternator B+ output terminal feeds through a MEGA FUSE to the battery positive terminal (red wire). Three regulator connector wires are shown: a white/black (W/BK) stator wire looping back to the alternator's S terminal, a yellow/white (Y/W) sense wire (A terminal) tied to the battery side of the mega fuse circuit, and a light green/red (LG/R) indicator wire (I terminal) that runs to a 'Hot in Run' 20A fuse through an optional instrument cluster charge lamp paralleled with a 510-ohm resistor. A reader can learn the correct wire colors, fuse protection (mega fuse on the output, 20A fuse on the indicator circuit), the charge-lamp/resistor arrangement, and the regulator pinout (S, A, I) needed to wire or retrofit a 3G alternator. The image carries a 'Copyright 2005' watermark and does not state a specific vehicle year or model.

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Frequently asked questions

How does the 3G alternator output connect to the battery?: The alternator's B+ output terminal connects to the battery positive through a MEGA FUSE, shown as a red wire in the diagram.
What wire colors are used on the 3G alternator regulator plug?: The diagram shows W/BK (white/black) for the stator wire, Y/W (yellow/white) for the sense wire to the battery/mega fuse side, and LG/R (light green/red) for the indicator wire to the charge lamp circuit.
How is the charge indicator lamp circuit wired?: The LG/R indicator wire runs from the regulator's I terminal to a 'Hot in Run' 20A fuse, passing through an optional instrument cluster charge lamp that is paralleled with a 510-ohm resistor.
What fuse protects the alternator indicator circuit?: A 20A fuse on a 'Hot in Run' circuit feeds the indicator/charge lamp wire.
What internal components of the 3G alternator are shown?: The diagram shows the stator, rectifier, and the regulator containing sensing and switching circuits plus the field winding, with regulator terminals labeled S, A, and I.