Dual-groove pulleys are 3.15 inches in diameter—slightly larger than the single groove. Purchased truck with 145,000 mi. The 2G’s biggest problem is under-capacity and wire size that just isn’t up to the job. We see so many rebuilt Autolite 1G alternators out there with incorrect fans for the production time frame, and we’d like to set that straight. It delivers plenty of amperage at idle, and can deliver as much as 230 amps depending on where you source your 3G.When Ford sold Autolite, it came up with a marketing solution known as Motorcraft. From February 1969 forward, alternator identification was stamped into the case.Early 1G alternators have a simple harness with four terminals and protective boots. It was also used on the all-new S197 Mustang for 2005. The Motorcraft name did wind up on some round-case alternators toward the end of round-case production in 1971-1972.The original Ford alternator rated at 38 to 55 amps. All rights reserved. The 4G is optimum for Modular applications with imposing induction systems.This is the Motorcraft 6G alternator, which arrived first on the ’99 Mustang GT and went on to be used on the all-new ’05 Mustang. Most rebuilt 1G alternators are 55-amp today with new rectifiers, stators, and rotors.

It can be upgraded to 65, 95, 130, or 200 amps, though you are better off going to the 3G if you want over 95 amps.The 2G is the second generation Ford alternator, internally-regulated with multiplex plug in 65- and 75-amp ratings. Used On: 2003-2007 Ford F-250 Super Duty 6.0L; 2003-2007 Ford F-350 Super Duty 6.0L; 2003-2007 Ford F-450 Super Duty 6.0L It is designed primarily for late-model Mustangs. Not all rebuilt 1G alternators are new inside. We would like to show you a description here but the site won’t allow us. When you start adding subwoofer sound systems, power windows and locks, high-intensity headlights, electric cooling fans, and the rest of it, it can make an older Autolite 1G alternator sweat with anxiety trying to keep up with the load.Whether you’re restoring a classic Mustang or building a hot restomod, it’s important to know a bit about Ford-based alternators and how they have evolved over the last 50 years, then make the right selection for your application. Some have Autolite on them, while some don’t. It is externally regulated. The Classic Ford forum is made possible by ad revenue. Alternator Terminal Identification Guide. 4G series used in some applications where the 6G series would not fit. You get what you pay for. First G-series to have internal voltage regulator.12:00 Mounting ear, M8 x 1.25 Thread, 148mm Diameter Large Case12:00, 10mm Mounting Ear, 148mm Diameter Large Case12:00, M8 x 1.25 Threading Mounting Ear, 148mm Diameter Large Case10:00, 10mm Mounting Ear, 148mm Diameter Large Case02:00, 11mm Mounting Ear, 148mm Diameter Large CaseSame size diameter as the 3G, but the 4G has a black metallic cover on the rear. You are better off having your 1G rebuilt by a trusted source.Although purists and restorers have spent a lot of time trying to sort out 1G alternator case differences, there are no pat answers. It’s a crap shoot when you buy a 1G from a discount auto parts store. The following information is presented as a guide when wiring and troubleshooting alternators. Rick Harmon of PA Performance suggests upgrading to the 3G if you’re in a position to do so and don’t mind replacing the factory 2G unit.The Motorcraft 3G alternator is available from a number of sources. Beginning in 1969, Ford conceived this multiplex Y plug that fits over terminals and is protected with caps over each terminal. BUYER'S GUIDE There are aftermarket 1G cases as well adding to the confusion.

We apologize for this inconvenience and encourage you to visit Sign Up today for our FREE Newsletter and get the latest articles and news delivered right to your inbox. The mounting styles are largely the same as the previous generations, though there are several mounting configurations which are only available in the small case size.copyright © 1985-2020, National Quick Start Sales. 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. These alternators originally were identifiable by a color-code (prior to February 1969) and alphanumeric markings in the casting; purple for 38-amp, orange for 42-amp, and red for 55-amp. The 4G really is engineered for late-model Mustangs and shouldn’t be considered for vintage installs. It was replaced by the 3G in 1994, then the 4G and 6G later.Not only were there differences in amperage rating, but also pulley sizing, width, and type, in either one-groove or two. Terminal Definition Notes A BATTERY Comes from the word ‘Accumulator’ B BATTERY Main Battery Feed B+ BATTERY Main Battery Feed C CENTRE Neutral, ‘Half-Voltage’, centre point of a Y-connected stator Output must be greater than demand or you wind up with dim headlights and a dead battery.


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