Ford truck alternators

Ford truck alternators DEFAULT

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Ford Alternator Upgrade for More Battery Charging Power

It’s cold. It’s dark. It’s raining. Your reach down and flip on the fog lights. They help but not that much. So you power up the light bar. Yup! That’s the ticket. The stereo is cranked up and life is good. Well, until you look at the volt gauge needle sitting in the red zone on the downhill side of Not good.

That’s life when you’re driving a truck built in the automotive electrical stone age of the ‘70s through the early ‘90s where alternators had an amp output the same as most highway speed limits of the time.

A quick history

During that time Ford used three generations of alternators in trucks. The First generation was dubbed the 1G (), which had an external regulator and produced amps. Its output was sufficient for a stock F-Series or Broncos, but add accessories and it just didn’t make the grade for most off-roaders.

The 1G was upgraded in with the second-generation “2G” that used an internal regulator for a more efficient unit that put out amps. The problem is the 2G was a headache for Ford: It required an additional side-wiring harness and the plastic power plugs were prone to falling apart, the spade terminals working loose, shorting wires and causing fires.

So when the new F (last generation Bronco) came out, Ford rolled out the 3G that brought both 95A and A versions to the battery-charging party along with several case configurations to fit a wide range of both cars and trucks.

The huge upgrade of this alternator over the 2G is a self-exciting, externally regulator that only required one cable between it and the battery to complete the circuit. Clean, simple and powerful.

It also worked with the no-charge idiot light, making it an ideal replacement for rigs running the older alternators – and for those Ford owners wanting to run extra lights, bigger sound systems, winches, plows and other aftermarket accessories.

Why 3G upgrade?

3Gs come in two sizes: A a 7-inch “small case” and an inch “large case.” Both can be found in and amp versions. The amp model is easily identifiable by three sets of four round cooling holes in the case’s ribs that make a “Y” behind the pulley. A amp high-output version uses three sets of two big cooling holes in the “Y.”

It’s not unusual to find 3Gs in pick-your-parts boneyards that put out amps at idle and up to amps at highway operating speed. The high-output 3Gs are interchangeable in vehicles that already have a factory 3G as long as the mounting patterns (two-ear, three-ear, side- and pivot mount) are the same.

That’s what makes a high-output 3G a great upgrade for any Bronco or F-Series owner running either of the alternator’s predecessors. In stock form it will provide two to three times more juice than the 1G/2G alternators and is far less likely to overheat under heavy current draw. The 3G can also run either a v-belt-style pulley or serpentine-belt pulley while fitting into those older mounts with very little effort.

A simple swap

The alternator shops I spoke with say the amp version can be found in both small- and large-case 3Gs. However, the latter is the only one that can support higher outputs, such as the Powermaster Performance 3G that we are swapping in to replace the wimpy amp 2G in our ’91 Eddie Bauer Bronco.

We found the diming of our Bronco’s headlights and slowing down of wipers when we powered up a few lighting accessories totally unacceptable. With our goal of adding a winch and 12V on-board air system in the very near future, along with more lights, it was time to put some real muscle in our old rig’s electrical system.

We turned to Powermaster Performance for advice. Powermaster is well respected in the off-road and racing industry for their top-shelf starters and alternators. JR Richmond, one of Powermaster’s lead techs, asked what we had in mind for electrical accessories and then suggested we swap out the OE 2G for their amp large-case 3G (#). He also recommended we have them “clock” the case so the charge post is at the 6 o’clock positon to place the wiring in the same position as it was from the factory. We did both.

In our case the swap was as simple as removing the old 2G and tossing the wiring harness. Then we did some very minor trimming on the aluminum alternator bracket, bolted on the Powermaster amp alternator, and ran a 4ga-charge cable through a amp MEGA fuse to the solenoid mounted on the fenderwell. The final step was routing a 4ga cable to from the fusible link to the positive post of the battery. That’s it.

The charge indicator light on the dash works and now the Bronco voltmeter needle stays steady a shadow over 14 volts no matter what accessories we turn on. When you have an alternator that cranks out amps at idle, at cruise, and on the top-end, it’s no surprise to see voltage remain unfazed with what we are powering at this time. We expect similar performance when we add LED lights and a few other goodies down the road.

Budget 3G Swap

Those on a tight budget that want to do a H.O. 3G upgrade can find them in a number of cars, trucks and vans in the mid- to late ‘90s. Here’re suggestions for sourcing a “pick-and-pull” high-output 3G:
• all engines use a inch (mounting ear spacing) pivot-mount, V-belt 2G alternator; good donor vehicle is alternator from non-DOHC Taurus’
• L ()/L () engines use inch pivot-mount, V-belt alternator; good donor vehicle is alternator from V-6 Taurus sedan/wagon
• ()/L () engines use a 7-inch pivot-mount, serpentine-belt 2G alternator; good donor vehicle is L E/F-Series Vans or V6 Mustangs
• ()/L () engines use 7” side-mount, serpentine-belt amp 3G alternator; good amp donor vehicle is L V6 Explorer

Note: Usually a 1G/2G to a high-output 3G swap requires slight mounting bracket clearancing due to its larger case and the use of a pigtail adapter or minor wiring modification. A amp 3G swap to amp 3G is plug-and-run. Use 4AWG (or larger) charge cable/grounds and MEGA fuse when upgrading to a amp or higher-output alternator.

Amp Draw

Plan out the amp draw accessories put on your alternator before ordering. These ballpark figures are done using OHM’s law where Amps=Watts/Voltage. Voltage varies from around 12v to v depending on the engine rpm and the output of the alternator. For example, a watt double-row LED lightbar would draw amps at volts, or amps at volts. Here’s a general overview of accessories and amp draws based on a volt power output:
6 LED Fog Light: amps
10” LED Lightbar: amps
40” W LED lightbar: amps
H11 55Wx2: amps
HID 55Wx2: amps
Xenon 35Wx2: amps
H3 W Spot Light: amps
12v Air Compressor: amps
10,pound-capacity winch: amps
CB Radio: amps

Installation Tips

The key to getting the maximum performance from a 3G alternator upgrade is making sure you don’t take shortcuts in an effort to save time or money. Here’re a few tips from Powermaster Performance’s JR Richmond along that line:
• Use at least a 4AWG charge wire between any amp-plus alternator and battery; using a smaller diameter wire creates too much resistance that can overheat and/or damage the charging system
• Keep the charge wire as short as possible to maximize alternator performance.
• Use a fusible link [MEGA Fuse] at least amps larger than the alternator’s maximum output.
• Ground the alternator housing if the brackets have any coating such as paint, powder coat, chrome or anodizing.
• Solder, don’t crimp terminal ends. Loose terminal ends from poor crimps are a big issue.
• Tighten belts. Slipping belts on manual tensioner systems, like those used on V-belt systems, generates a lot of heat that will transfer into the alternator, causing it to fail. (Over-tightening a belt will not affect a modern alternator’s bearings.)

Amazon Affiliate links are our attempt to show you real-world pricing and availability for the products we review and install, and while the Amazon links are separate from editorial and advertising, the Four Wheeler Network may receive a commission on purchases made through our posts.

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10 Best Alternators For Ford F

A car alternator works with your car’s battery to provide electricity to different parts of your car. These sections include your dashboard lights, headlights, interior lights, and radio. 

As Ford F owner who wants the best alternator, below are some of the best options for your car.

1. DB Electrical AFD Alternator

This DB electrical alternator is a hundred percent new aftermarket product designed to meet a car’s OEM specifications. It weighs 12 pounds with a brushed exterior and amperage of  The makers of DB alternators pay close attention to details so you can rest assured that the alternator will be able to function in a high-heat environment and will withstand heavy duties. With a voltage of 12, S6 pulley class and IR regulator, you can be certain this alternator will benefit your car.

Available Here.

2. Roadstar Alternator

Roadstar alternator features 12 volts, an internal fan and amperage of  The alternator is produced with advanced technology and has been tested to ensure it is reliable and of high quality. You can also replace the alternator directly and will only be required to connect the battery charging wire with the alternator’s terminal output. This hundred percent new aftermarket alternator is designed to ensure your car functions perfectly so you can purchase it without doubts. 

Available Here.

3. DB Electrical AFD Alternator 

10 Best Alternators For Ford F

This DB alternator model is made with quality materials and premium craftsmanship that enhances its performance. And you don’t have to worry about the temperature because this alternator functions best in a warm/hot a car engine. The high-temperature grease and epoxy give it strong resistance to heat. It also features heavy-duty rectifiers that make it durable. For your Ford F, you can rest assured this alternator will fit as it is designed to fit perfectly after installation.

Available Here.

4. DB Electrical AFD Alternator

This DB alternator weighs pounds which makes it light enough for your Ford F truck. The alternator is greased to ensure it is resistant to heat therefore it works efficiently both in cool and hot temperatures. To smoothen any doubts you may have concerning the alternator, it comes with a final test result that shows you how well it works. It also has top-quality bearings and heavy-duty rectifiers that increase its lifespan. 

Available Here. 

5. DB Electrical AFD Alternator

This alternator is made with new components from scratch to ensure it functions efficiently. The key components are also greased to make them reliable under harsh conditions. The alternator is also tested with computers to ensure terminal function, voltage stability, and efficiency. With a weight of pounds, this alternator is light enough to carry out all its functions within your Ford F

Available Here.

6. New Alternator For Ford F0

The new alternator for Ford F carries everything in your car including fans, heaters, televisions, air conditioners, stereos, lightings, and amplifiers. And it carries out this task while ensuring your auxiliary battery remains charged. It can also be said to be one of the lightest alternators for the Ford F as it weighs less than 7 pounds. The important components of the alternator are all greased to keep it heat resistant and the use of quality materials makes it durable.

Available Here. 

7. Premier Gear PG Alternator

Premier Gear PG alternator is a durable and high-quality alternator for your Ford F It is designed to prevent damages from excess charging and to provide protection from short wirings that often lead to open circuits or spikes. You can expect a consistent performance from the alternator because months and years after use, it will still function efficiently. The components of the alternator help resist moisture and heat and have a quality bearing. This Premier Gear alternator also features 12 volts, 60 amperages, 1 groove pulley, and clockwise rotation. 

Available Here.

8. Premier Gear PG Alternator

One of the best things about this Premier Gear alternator is that it is designed to surpass the original standards of the average alternator. This alternator is manufactured with new and high-quality components, providing you with an efficient device. The finished alternators are tested with OEM standards for performance and specifications before placed in the market. This means they are validated for outputs on full load speed or idle speed. They also function in any environment and have a high level of endurance. Lastly, Kyodo Yushi grease is used on the key components of the alternator to keep them functional in high temperatures and high speed.

Available Here.

9. Premier Gear PG Alternator

This alternator is manufactured with a process that makes sure it provides consistent performance. It also offers protection during excessive charging and protects your car from open circuits or sparks triggered by short car wiring. With a amperage, clockwise rotation, 12 volts, 6-groove pulley, plug clock, and internal fan, you can be reassured that this alternator will serve all its functions and more. It has also been made to display high endurance, to withstand humidity, vibration and salt spray.

Available Here.

  Premier Gear PG Alternator

10 Best Alternators For Ford F

Most of the recent automotive engines are more portable and stronger than before. The demands for charging systems have also boosted the growth of advanced alternators. This is why Premier Gear designs alternators that surpass expectations and provides protection for your car. The Premier Gear PG Alternator features 55 amperage, clockwise rotation, 4 groove pulley, an internal fan, and 12 volts. The alternator’s wiring and bearing are also designed to help resist moisture and heat. The OEM diodes used ensures a maximum field life. With this alternator, you can be assured of endurance, adaptation to humidity, protection from vibrations and salt sprays.

Available Here.  

Alternators ensure your car performs impressively as it constantly provides sufficient electricity for your electronic ignitions. It is also more consistent and convenient than a battery charger. So invest in an alternator for your Ford F today and watch your car run at its full capacity!

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