This is a common upgrade to replace the 52 amp alternator/regulator setup with a 3G alternator from a 93 3.8 V6 Ford Taurus. Getting more amps for better charging at idle and the electric juice to run aftermarket bush lights, winches, dual batteries, electric fans, satellite navigation and your aftermarket stereo equipment.
There are lots of article out there that give advice. I found them good but wanted to fill in some of the blanks and consolodate the information to help anyone else pondering the upgrade. It was not as bad as I had thought and is really something a back yard mechanic can do.
Why go 3G alternator and wiring diagram
BC 4×4 has some great pictures of a swap
Picture of 3G on Taurus
Vehicle: 79′ Ford Bronco with a 74′ 460 motor. Really this could work on any 1978 to 1979 Bronco or earlier F series trucks.
Tools: Wire stripers, air compressor and impact gun, box wrenches, pair of pliers
Step 1) Get yourself a 3G (3rd generation) alternator
These are found in 90-95 3.8 V6 Ford Taurus and are a simple removal in a wrecking yard. Cut the serpentine belt to remove belt tension. Undo the bolts, cut the wires and you are done.
TIP: Many vehicles in pick your own part type establishments are high mileage. Look for a reconditioned alternator as it may have less wear. These normally have a sticker on them by the reconditioning company.
Step 2) Unbolt, unplug and remove the stock OEM alternator.
Three wires removed two mounting bolts frees the old alternator. I left my wiring connected to the battery and harness. If you do this remember to tape off the power wire to avoid any sparks grounding against the frame.
Step 3) I call this the “will it fit step”.
Compare the new to the old. Does it’s footprint look the same? I had to use an angle grinder to shave down one of the ears to get mine to fit. I selected the 8.25 3G and in having to modify it, maybe the 7 would have fit fine. The casting on the main mounting bolt was not the best so I ran a drill through it to clean it up.
TIP: You will probably need an impact gun to relocate the v-belt pully onto the 3G version.
Step 4) Install the 3G and connect as per wiring diagram
This upgrade really simplifies the wiring. Connect the 3G up to the battery and be sure to connect the green wire to the factory wiring or it won’t charge. I chose to leave the old wiring in place for a few days before I decided to clip it free.
Start the truck and check the charge. You should now have the amps to run all the aftermarket bush lights and glowing pedal accessories you want.
Vehicle used: 79′ Ford Bronco with a 74′ 460 motor. Really this could work on any 1978 to 1979 Bronco or earlier F series trucks.
