3G Alternator | One Wire, High Output, 90/130 Amp | 66-79 Bronco, 65-79 Ford Truck SKU: 6013

3G Alternator | One Wire, High Output, 90/130 Amp | 66-79 Bronco, 65-79 Ford Truck

Full description

Early Bronco 3G Alternator Upgrade | High Output Charging System

Fits 1966-79 Ford Bronco and 1965-79 Ford F-Series Truck with Ford 289, 302, 351W, 351M & 400 V8 or Ford 170, 200 & 300 Inline 6-cylinder

Upgrade your classic Ford charging system with a High Output 3G Alternator designed to support modern electrical demands while retaining factory-style fitment. This upgrade is especially popular as an Early Bronco alternator upgrade, providing strong output at idle and cruising speeds for Broncos running EFI, electric fans, auxiliary lighting, or other electrical accessories.

Featuring an internally regulated, self-exciting one-wire design, this 3G alternator simplifies installation while delivering dependable charging performance for classic Broncos and vintage Ford trucks.

High Output Performance: Produces approximately 90 amps at idle and up to 130 amps at speed
One-Wire Design: Internally regulated for simplified wiring and a clean install
Factory Bracket Fitment: Designed to bolt into factory Ford alternator brackets on Broncos and F-Series trucks
Pulley Options: Available with V-belt or serpentine pulley to match your engine setup
30-Month Warranty: Backed against manufacturer defects

Wiring & Installation Notes

For best results, we recommend using our #6025 Battery Charge Cable or a minimum 6-gauge charge wire when installing this alternator.

After installation, the factory ALT gauge will no longer function. We recommend upgrading to a voltage gauge, such as our #6026 Voltage Gauge, which fits the stock gauge cluster.

Physically mounting the alternator is straightforward. This unit installs in the factory alternator location using existing brackets. Simply remove the original alternator and bolt this one in place.

Fitment Note: While designed around common Early Bronco alternator upgrades, this 3G unit also fits many 1966-79 Broncos and 1965-79 Ford F-Series trucks using factory-style alternator brackets. Pulley alignment, belt configuration, and charge wiring should always be verified during installation.

Upgrade your Early Bronco or classic Ford truck with a high-output 3G alternator that delivers strong charging, simplified wiring, and factory-style mounting.

Detailed Vehicle Fitment

Year

Make

Model

Fits both V8 and 6-cylinder Engines

Year	Make	Model
1966	Ford	Bronco
1967	Ford	Bronco
1968	Ford	Bronco
1969	Ford	Bronco
1970	Ford	Bronco
1971	Ford	Bronco
1972	Ford	Bronco
1973	Ford	Bronco
1974	Ford	Bronco
1975	Ford	Bronco
1976	Ford	Bronco
1977	Ford	Bronco
1978	Ford	Bronco
1979	Ford	Bronco
1965	Ford	F100
1966	Ford	F100
1967	Ford	F100
1968	Ford	F100
1969	Ford	F100
1970	Ford	F100
1971	Ford	F100
1972	Ford	F100
1973	Ford	F100
1974	Ford	F100
1975	Ford	F100
1976	Ford	F100
1977	Ford	F100
1978	Ford	F100
1979	Ford	F100
1975	Ford	F150
1976	Ford	F150
1977	Ford	F150
1978	Ford	F150
1979	Ford	F150
1965	Ford	F250
1966	Ford	F250
1967	Ford	F250
1968	Ford	F250
1969	Ford	F250
1970	Ford	F250
1971	Ford	F250
1972	Ford	F250
1973	Ford	F250
1974	Ford	F250
1975	Ford	F250
1976	Ford	F250
1977	Ford	F250
1978	Ford	F250
1979	Ford	F250
1965	Ford	F350
1966	Ford	F350
1967	Ford	F350
1968	Ford	F350
1969	Ford	F350
1970	Ford	F350
1971	Ford	F350
1972	Ford	F350
1973	Ford	F350
1974	Ford	F350
1975	Ford	F350
1976	Ford	F350
1977	Ford	F350
1978	Ford	F350
1979	Ford	F350

California residents: Proposition 65 Warning

Questions & Answers

PRODUCT REVIEWS

Kevin Black

Reviewed 09/15/2025

Easy hook up, so much more power than the original.

Tony T.

Reviewed 08/08/2025

Instructions could be better! There are three wires that I had to hookup, not just one. After a call WH, I talk to John (thanks) and he set me straight. Both extra wires connect to alternator, if they had connected them in the box I would of had no issues. For dummies like me connect the white with a black trace to the recessed connector. And connect the yellow blue trace to the positive post on alt. along with your big red battery cable.

Mark S.

Reviewed 06/20/2024

"I've run one for ~10 years now, bought it from WildHorses. Very happy with it." - Mark S. on Facebook

Chris Symes

Reviewed 08/29/2023

My stock alternator was mounted low on the passenger side of the engine compartment. This alternator was too big to fit there so I relocated it high on the passenger side where it fit easily. I was able to use the factory bracket that allowed for both. The alternator works perfectly and wired up easily with the fused wiring that I also purchased from Wild Horses.

Alex San Juan

Reviewed 07/21/2022

351W....Replacing an older alternator, but don't think it's the stock one. I definitely required the bottom bracket with the curve. I used the top bracket from a competitor due long lead times, but didn't fit. The two holes to the center of the block line up but were short on reaching the top of the alternator. I did require the smaller spacer for the top, which I believe is 1.675 (not confirmed) in length. Once installed, no problems running the 40AMP electric fan and lights.

Chris Abacherli

Reviewed 07/12/2021

I would suggest swapping to this alternator.

Chad A Teets

Reviewed 03/25/2021

Had a mishap with my old alternator, wiring harness melted to the engine block and caught fire...all was good though, just needed to replace Alternator and rewire. This NEW alternator was easy to cable up with 1 wire and I also purchased the HIGH AMP fuse and cable set as well. Only problem is that this 3G alternator is much different in size compared to my old one...a bit of modifications to my old Alternator bracket fixed the issue!

Jacob B

Reviewed 06/26/2019

Works great, the optional fuse is much appreciated as well. As always... fast shipping, solid parts and 10/10 customer services from WH.

chad kuck

Reviewed 03/20/2018

quality part exactly what I needed good price and as always the folks at wild horse outdid themselves with the customer service

Daryl

Reviewed 11/05/2016

I have two of these now. I put one on my bronco a few years ago and liked it enough that I swapped it onto my 84 mustang SVO. my headlights don't dim at idle now!

Pavizonis

Reviewed 10/05/2016

simple install, worked perfectly, solved charging problems and low voltage

koda

Reviewed 09/07/2016

very good, no issues

Scott Barnes

Reviewed 08/01/2016

Bought this, along with the fuse kit (highly recommended) to upgrade my stock alternator at the same time I replaced my body harness. SO glad I decided to do it. Very simple upgrade and perfect fit.

Rob

Reviewed 12/19/2015

This alternator was a great upgrade from my 1g alt Since it has a built in regulator, it cleaned up the wires in my compartment. So far, it has done a great job at keeping my battery charged.

joe

Reviewed 09/15/2014

Works great with a single v-belt and it keeps my battery charged when winching compared to the stock alternator

Mark W. Sanders

Reviewed 02/28/2014

It was easy to order, arrived quickly, no surpises on install and performs well.

Reviewed 02/24/2014

This alternator fits and works as described. The one wire hook-up allowed me to eliminate some parts and really cleaned up my engine bay

Marcus Wheeler

Reviewed 01/22/2014

This is perfect alt. No more dimming head lights or anything runs all my accessories no issues at all I highly recommend this!

Deeno

Reviewed 07/16/2011

I recently purchased the 90/130 amp high output alternater and I am very pleased with the product. Performs just like you guys said it would.

Chris Armitage

Reviewed 07/07/2011

This has been a great alternator. The install was incredibly easy (Hard to mess up one wire). At idle, my voltage stays constant unlike the 12si alternator that I replaced. Had a little problem with belt squeal (V-Belt) but after re-tightening, it has not come back. I did end up putting a longer bolt in the bottom tension hole to make sure I did not strip the case. I would definitely recommend this alternator.

Reviews

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Part	Name	Price
6025	Battery Charge Cable + AMG Fuse Kit for High Output Alternators	$44.99	Purchase Battery Charge Cable + AMG Fuse Kit for High Output Alternators

6018	Alternator Spacer \| SBF 289 302 V8 \| 66-77 Ford Bronco	$14.99	Purchase Alternator Spacer \| SBF 289 302 V8 \| 66-77 Ford Bronco

6007	Chrome Alternator Brackets \| SBF 289 302 351W V8 \| 66-77 Ford Bronco	$21.99	Purchase Chrome Alternator Brackets \| SBF 289 302 351W V8 \| 66-77 Ford Bronco

6008	Black Alternator Brackets \| SBF 289 302 351W V8 \| 66-77 Ford Bronco	$19.99	Purchase Black Alternator Brackets \| SBF 289 302 351W V8 \| 66-77 Ford Bronco

6026	Voltage Gauge for Stock Cluster \| 66-77 Bronco, 61-66 Ford Truck	$59.99	Purchase Voltage Gauge for Stock Cluster \| 66-77 Bronco, 61-66 Ford Truck

6020	Alternator Spacer & Hardware \| SBF 289 302 V8 \| 66-77 Ford Bronco	$16.99	Purchase Alternator Spacer & Hardware \| SBF 289 302 V8 \| 66-77 Ford Bronco