How to Identify Your Ford 3G, 4G & 6G Series Alternator


Need a High Output Alternator for Your Ford Vehicle?

Identify Your Ford Alternator Visually

History of the Ford G-Series Alternators

The first G-series was the 1G externally regulated alternator. The 2G was the second, but uses a power plug instead of battery posts and cannot be upgraded. Usually swapped to the 3G Series which is still in use and is easily upgraded. 4G series used in some applications where the 6G series would not fit. 4G used on some Crown Victoria and has very unique mounting applications. 6G series is used on many pick up trucks and diesel vehicles, as well as on some models of the Crown Victoria.


3G Series Alternators

Alternator Features

The 3G Series alternator features internal fans and voltage regulator. First G-series to have internal voltage regulator.

Click Here To Order 3G Series Alternators 12:00, m8 mounting ear, large case 3g series V-Shaped Feet, 148mm Diameter Large Case Side Mount, 148mm Diameter Large Case 12:00, 10mm Mounting Ear, 148mm Diameter Large Case 12:00, M8 x 1.25 Threading Mounting Ear, 148mm Diameter Large Case 10:00, 10mm Mounting Ear, 148mm Diameter Large Case

Lester Nos: 7769, 7774, 7789 10:00, 10mm Mounting Ear, 148mm Diameter Large Case Used On: (1995-94) Ford Taurus 3.0L (1997-95) Ford Contour, Mercury Mystique 2.0L

12:00, M8 x 1.25 Threading Mounting Ear, 148mm Diameter Large Case 10:00, 10mm Mounting Ear, 148mm Diameter Large Case

Lester Nos: 7775 02:00, 11mm Mounting Ear, 148mm Diameter Large Case

Lester Nos: 8267 V-Shaped Feet, 148mm Diameter Large Case


4G Series Alternators

Alternator Features

Same size diameter as the 3G, but the 4G has a black metallic cover on the rear. Uses the same plug as the 3G series alternator. We believe the 3G is the superior alternator, but the 4G series comes in several unique mounting styles which aren't compatible with 3G series alternators. The 4G series side mount looks visually simmilar to the 3G series Side Mount, but the mounting holes do not line up.

Click Here to Order 4G Series Large Case Alternators V-Shaped Feet, 142mm Stator Diameter Case 12:30 & 10:00, 10mm Mounting Ears, 142mm Stator Diameter Case

Lester Nos: 7773, 7781, 8251 V-Shaped Feet, 142mm Stator Diameter Case

Lester Nos: 7780 12:30 & 10:00, 10mm Mounting Ears, 142mm Stator Diameter Case

Side Mount, 142mm Stator Diameter Case

Lester Nos: 7786, 7787 Side Mount, 142mm Stator Diameter Case


GG Series Alternators

Alternator Features

6G Series alternators

Click Here to Order 6G Series Large Case Alternators
Click Here to Order the 6G Series Large Case Upgrade For "Power Stroke" Diesel Engines
Click Here to Order the 6G Series Large Case Alternator Upgrade for Crown Victoria Vehicles V-Shaped Feet, Large Case Side Mount, Large Case

Lester Nos: 7795 V-Shaped Feet, Large Case

Lester Nos: 8253 Side Mount, Large Case

V-Shaped Feet, Large Case Side Mount, Large Case

Lester Nos: 8303 V-Shaped Feet, Large Case

Lester Nos: 8408, 8478 Side Mount, Large Case