Whenever possible it is best to upgrade from the Small Case 6G series Alternator to the Large Case unit. The Large Case Alternator gives you more power at idle, absorbs and dissipates heat better and will last longer at higher amperages. The Large Case Units bolt directly in place of the small case and the plug is the same. Unfortunately, not every mounting style developed by Ford Motor Company comes in both Small Case and Large Case Style. The most common Large Case upgrade is in Ford's F and E series pick-up trucks and vans, as well as, Excursions, Explorer and Expeditions and Mercury Mountaineer (Figure 2, left center). Many Ford trucks came standard with the Small Case alternator and can be upgraded to the Large Case unit or better performance. Other mounting styles only available in the Small Case unit are the vertical "6-12" mount and was featured on Some Ford and Mercury trucks & SUV's, Mustangs etc (Figure 3, right center). The second is an offset or "2-foot" mount, which is common to various Ford and Lincoln vehicles (Figure 4, upper right). The final mount is common to various Ford and Mercury vehicles, it is a "Dual-Ear" mount that has mounting tabs on both the Drive-End (front) and Slip-Ring-End (rear) of the alternator (Figure 5, right). All of the small case alternators are available in the same amperages as the large case and can be ordered below. Just be sure to include your vehicle's year, make, model, and engine size during the order process. If a large case unit is available for your vehicle we will send the large case unit. The Quicktifier remote bridge rectifier is recommended on 200 amp units. Unfortunately, we cannot at this time offer the 250 amp variant in the small case form factor. If your not sure if your Ford Motor Company vehicle has a large case unit upgrade just call and we can tell you.
1998 and Older Ford 7.3L Power Stroke Diesel uses the 3G Series Large Case Alternator. Click Here for the 3G Series Heavy Duty High Output Alternators.
After 1999 Ford no longer offered
the large case alternator upgrade option for
diesel equipped vehicles. The Standard
Alternator was the small case 110 amp 6G series
alternator on the
1999 the small case was the only choice and has been
plagued with reliability issues. WE HAVE THE SOLUTION
WITH THE LARGE CASE 6G UPGRADE UNIT THAT FITS IN THE SAME MOUNT, USES
THE SAME BELT AND PLUGS DIRECTLY IN TO YOUR EXISTING PLUG.
"NO ADAPTER HARNESS NEEDED" Click Here for Large Case 6G Series Heavy Duty High Output Alternators
Upgrade to our heavy duty 6G series high output alternator available in 140, 160, 200 and 250 amp models . All 3G and 6G units are available with or without the Quicktifier Remote Bridge Rectifier System (click here for more information) based on technology from the Extreme Duty Dual Rectifier CS144 with over eight years of of experience in the field. We can now provide a dual and triple bridge rectifier option for the toughest 6G series alternator with a heavy duty bridge rectifier combined with either the 210 amp or 420 amp external bridge rectifier for extra durability.
Order at bottom of this page or click here . Units come in 140, 160, 200 and 250 amp options with heavy duty bridge rectifier and voltage regulator. All amperages can be ordered with or without the Quicktifier.
In 1999 Ford Motor Company switched from using the
large case 3G alternator on the 7.3L Power Stroke Diesel to the small case 110 amp 6G series alternator. After 99 Ford no longer offered the large case alternator upgrade option for power stroke diesel equipped vehicles. Previously, to get more charging power for your 7.3, 6.0 or 6.4 diesel your options are either, dual alternators or upgrade your existing small case alternator. The problem with upgrading your existing small case alternator is that they tend to be less reliable when upgraded. Plus with an upgraded version of the small case 6G alternator you will not get extra power at lower engine speeds, all the extra power is when you rev the motor.
So if you need more charging power or your alternator is getting old and tired why not upgrade to the superior large case 6G series alternator. We have the 6G large case alternator in several amperages and duty ratings and mounting styles. Plus, our alternators are brand new using nothing but Top Quality Components. Click here to see a partial list of common vehicle applications .
110 amp small case Motorcraft 6G series alternator shown on left. next to a 200 amp Heavy Duty Large Case 6G type alternator shown on right. The alternator shown is for Ford Diesel Motors. We have this small case to large case in several mounting styles for different models. No adapter wiring harness needed, the large case plugs directly into your existing wiring harness
To the left is the Ford Motorcraft type 6G series heavy
duty, high amp alternator with a Quicktifier Dual
Bridge Rectifier upgrade, this addition provides tremendous
durability for high demand situations. When added to the
heavy duty model 6G series high amp alternator with the
upgraded voltage regulator, it creates an unstoppable
If you do not choose the Dual or Triple Bridge Rectifier option your alternator will look just like a standard alternator, you will not get the Quicktifier box and the extra wiring.
The Ford Motorcraft type 6G series heavy duty, high amp alternator is used on many Ford vehicles, below is an incomplete list, please call 1-616-606-5045 to see if your vehicle requires a 6G series heavy duty high amp alternator .
The 250 amp Ford Motorcraft type 6G series high amp alternator requires a Quicktifier Remote Bridge Rectifier because the output is to great for a single bridge rectifier. Please make a Quicktifier selection when ordering your high amp 6G series alternator. If you order a 6G series alternator at over 200 amps without a second set of diodes, it will fail more quickly , 6G series bridge rectifiers are not heavy duty enough to handle the excessive amperage alone .