3G Interchange Facts. If you're thinking 3G read here. - FSB Forums
Register Home Forums Active Topics Photo Gallery All Albums Mark Forums Read Auto EscrowInsurance FSB Store
FullsizeBronco.com is the premier Ford Bronco Forum on the internet. Registered Users do not see the above ads.
Reply
 
Thread Tools Display Modes
Old 12-09-2005, 06:39 PM   #1
Clarko
Bronkin' 'Round!
 
Clarko's Avatar
 
Join Date: Mar 2004
Location: Woodland Hills, CA
Posts: 2,763
iTrader: (1)
Bronco Info: 94 XLT 351 E4OD 4" Superlift
3G Interchange Facts. If you're thinking 3G read here.

PLEASE READ THIS ENTIRE POST BEFORE ASKING QUESTIONS!!!

Had to start this thread since there is much misinformation and confusion about the 3G alternator upgrade. This is not an install thread, just a guide on where to get the alt you need, a wiring diagram, and pulley sizing. All photos and some of the text is courtesy of Ryan at OldFuelInjection.com.

Why go 3G?
Because your factory alternator is barely adequate for your truck, stock.
Added off-road lights or a big stereo?
You need a bigger alternator!
Need me to show you?

And that's alternator RPM, not engine rpm. The alt spins much faster than the engine.
Alt RPM = Engine RPM x Crank Pulley Diameter ÷ Alt Pulley Diameter.
87-92 is the blue line.
93-96 is the green line.
78-86 is less than the blue line.


There are 3 different mounting styles for the 3G alternator that can be used as an upgrade on other vehicles:


If you have a 66-86, anything with v-belts, or a 87-98 300 (4.9L) or 460 (7.5L): you'll need a Pivot Mount w/ 8.25” ear spacing alternator. Some 90, any 91-92, and some 93-99 non DOHC Ford Taurus will be able to donate it's alternator to your truck. On your v-belt truck, you may also be able to use one that fits the 87-92 serpentine setup (Pivot Mount w/ 7.00” ear spacing) but some may have fitment issues with smog pump location. The Pivot Mount w/ 8.25” ear spacing can be swapped into:
1966-1986 V-belt Mustangs
1966-1987 V-Belt Broncos/E-Series/F-series
1992-1997 4.9L & 7.5L Bronco/F-Series/E-Series
Other V-belt vehicles that can adjust to an 8.25” wide Pivot mount alternator

A wide-eared Taurus alt will ONLY fit a 302 or 351W if it is a V-belt setup since it's wider than a serpentine one.

Comparson between Narrow-Eared and Wide-Eared:



If you have an 87-92 302 (5.0L) or 351W (5.8L): you have a 2G alternator. This is an early serpentine style. This can only be replaced with a Pivot Mount w/ 7.00” ear spacing alternator. Minor bracket clearancing may be required. This can be found in the following cars:
93-99 narrow-eared non-DOHC Taurus
94-95 V8 Mustang
94-00 V6 Mustang
94-97 V6 T-Bird/Cougar
95-98 Windstar
91-94 V6 Lincoln Continental.

The early serpentine car and truck alts on Ryan's site are interchangable but the plug and charge stud are clocked differently to fit the wiring to the bracket better. The Pivot Mount w/ 7.00” ear spacing can be swapped into:
1987-1992 Broncos/E-Series/F-series
1966-1995 Mustangs
Other vehicles that use a 7.00” wide Pivot mount alternator
It looks like this:
Where your brackets may need to be clearanced:


If you have a 93-96 302 (5.0L) or 351W (5.8L): you have a Side Mount 3G already but a 95 amp one. You DO NOT need to get a wiring harness, as since you already have a 3G, it's plug and play!!! I strongly urge you to get a larger charge cable and megafuse though. This is your current alt:

This is the one you need:

Here's a great way to tell the difference:

For a 130 amp, you can get that for a:
93-96 V8 Econoline with Air Conditioning or the High Output Alternator options
97-03 V6 Econoline E-Series or F-150
95-01 4.0 V6 Explorer or Ranger

at your local parts house for less than eBay. You can also get 160 amp alternators, with NO core charge and cheaper than a new 130, from Ryan right here.
You'll need the one for late serp. vehicles.
The Side Mount can be swapped into:
1993-1997 5.0L, 5.8L & 7.3L Bronco/F-Series/E-Series
Other vehicles that use a Side Mount alternator
Or you could try to find one like that at a junkyard but good luck.

Plug Clocking: Each style may have the rear plugs clocked 3 different ways to fit their various vehicles better. They will still fit no matter the clocking but you can remove the case bolts, and reclock the rear to get your optimum position.



Charge Cables: When you swap from a 1G or a low output 3G to a 130 or more amp 3G, although you do not NEED a larger charge cable such as a 2 Gauge, it is a great idea. Smaller wires/cables cannot always handle such a load and they tend to heat up, some to the point of melting the wire and could start a fire. ALWAYS make sure you use a megafuse rated at least 15-25 amps above your alternator amperage.

Pulleys: For pulleys, you can either re-use your old one, which sometimes you may need a very small washer to use as a spacer if it rubs in the 3G case at all, or you can get a different sized one. It all depends on your needs. A smaller pulley will spin the alternator faster at idle to create maximum output. A larger pulley will allow the engine to rev higher without driving the alternator to fast. Large 3G alternators are safe to ~15,000RPM max. Again, Alt RPM = Engine RPM x Crank Pulley Diameter ÷ Alt Pulley Diameter.

Wiring Diagram:

You can make your own or buy a complete one from here: http://rjminjectiontech.com/?p=7

Factory Carb Users:
If you have a Factory Ford carburetor (Holley model 4180) with a wire that connects directly to your 1G alt to your electric choke, get a 12 volt electric choke for a Holley 4160, P/N 45-223, and swap it out. Then wire the new choke to 12 volts.

This post will continually be edited as information pops up. Please post any errors you find so this can be THE thread for 3G interchange information.

A version of this thread is also hosted at:
Four Eyed Pride: http://www.foureyedpride.com/phpBB2/...ic.php?t=23682
__________________
Brian

Click either pic for SuperFord.

Last edited by Clarko; 12-11-2012 at 05:40 PM. Reason: Fixed the images and a little general housekeeping.
Clarko is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 12-09-2005, 07:12 PM   #2
90Beater
At least I got no Jeep
 
90Beater's Avatar
 
Join Date: May 2004
Location: Canyon Country, CA
Posts: 4,641
iTrader: (4)
Bronco Info: Bronco is too full of spiders to sit inside
Make it a sticky mods.
90Beater is offline   Reply With Quote
Old 12-09-2005, 07:20 PM   #3
Bronco Rob
Zombie Hunter
 
Bronco Rob's Avatar
 
Join Date: Jan 2005
Location: The Land of Misfit Toys
Posts: 13,706
iTrader: (12)
Bronco Info: 1993 Eddie Bauer, 351, 5.8 liter V8, somebody come help me put all this junk i just bought on!!
Am i reading that right, the 93 Bronco's are a straight swap?
__________________
Bronco Rob is offline   Reply With Quote
Old 12-09-2005, 07:23 PM   #4
Clarko
Bronkin' 'Round!
 
Clarko's Avatar
 
Join Date: Mar 2004
Location: Woodland Hills, CA
Posts: 2,763
iTrader: (1)
Bronco Info: 94 XLT 351 E4OD 4" Superlift
Quote:
Originally Posted by Bronco Rob
Am i reading that right, the 93 Bronco's are a straight swap?
With a larger charge cable and megafuse, they are.
__________________
Brian

Click either pic for SuperFord.
Clarko is offline   Reply With Quote
Old 12-09-2005, 08:13 PM   #5
DcSkater602
Registered User
 
DcSkater602's Avatar
 
Join Date: Feb 2005
Location: West Grove, Pa
Posts: 3,430
iTrader: (4)
Bronco Info: 91 bronco Rain cloud of broken stuff edition
hey a ? for ryan. How do i upgrade the 130 amp 3g to a 200 amp??

thanx in advance

DC
__________________
Quote:
I want to convert my 4wd Superduty to 2wd. I can take apart a flashlight in under a minute. So im sure i can handle this
check out the broncos full rebuild
DcSkater602 is offline   Reply With Quote
Old 12-09-2005, 08:26 PM   #6
Clarko
Bronkin' 'Round!
 
Clarko's Avatar
 
Join Date: Mar 2004
Location: Woodland Hills, CA
Posts: 2,763
iTrader: (1)
Bronco Info: 94 XLT 351 E4OD 4" Superlift
Quote:
Originally Posted by DcSkater602
hey a ? for ryan. How do i upgrade the 130 amp 3g to a 200 amp??

thanx in advance

DC
You'll have to take the alternator apart, heat up the solder at 6 points, remove the rectifier from the windings, install the new one and solder that in.
__________________
Brian

Click either pic for SuperFord.
Clarko is offline   Reply With Quote
Old 12-09-2005, 08:38 PM   #7
fastpat
Fast member
 
fastpat's Avatar
 
Join Date: Oct 2005
Location: Travelers Rest, South Carolina
Posts: 214
iTrader: (0)
Bronco Info: 96 XL, M5OD, 6 in. lift, JBA headers, MSD Offroad, full duals, 3.55's
I acquired a 4G alternator for a reasonable sum, with what appears to be the correct mounts for my '96. Other than beefing up the charging cable and so forth, any issues? It's rumored to be 170 amp unit, anyone know?
__________________
Pat
fastpat is offline   Reply With Quote
Old 12-09-2005, 11:31 PM   #8
Optika1 illushun
Registered User
 
Optika1 illushun's Avatar
 
Join Date: Nov 2004
Location: Coal Region, Pa
Posts: 1,153
iTrader: (1)
Bronco Info: 1993 F-150 XLT 4x4 300/E4OD
i can add info about the EFI 300s if u would like sometime soon.
__________________
1993 F-150 XLT 4x4
-300/E4OD/SA D44/8.8/BW1356
1988 F-350 Custom 4x4
-7.3IDI/ZF/D60/10.25/BW1356
Optika1 illushun is offline   Reply With Quote
Old 12-09-2005, 11:38 PM   #9
Clarko
Bronkin' 'Round!
 
Clarko's Avatar
 
Join Date: Mar 2004
Location: Woodland Hills, CA
Posts: 2,763
iTrader: (1)
Bronco Info: 94 XLT 351 E4OD 4" Superlift
Quote:
Originally Posted by Optika1 illushun
i can add info about the EFI 300s if u would like sometime soon.
Either post it up here or PM it to me and I'll add it to the main post.
__________________
Brian

Click either pic for SuperFord.
Clarko is offline   Reply With Quote
Old 12-10-2005, 02:27 AM   #10
Fireguy50
OUT OF BUSINESS / M.I.A.
 
Fireguy50's Avatar
 
Join Date: Apr 2003
Location: Michigan
Posts: 11,484
iTrader: (19)
Bronco Info: rusty


__________________
Ryan McCormick


Fuel Injection Technical Library
Parts replacement is not auto repair, if you can’t diagnose, don’t open the hood!
Fireguy50 is offline   Reply With Quote
Old 12-10-2005, 02:29 AM   #11
Fireguy50
OUT OF BUSINESS / M.I.A.
 
Fireguy50's Avatar
 
Join Date: Apr 2003
Location: Michigan
Posts: 11,484
iTrader: (19)
Bronco Info: rusty
Quote:
Originally Posted by fastpat
I acquired a 4G alternator for a reasonable sum, with what appears to be the correct mounts for my '96. Other than beefing up the charging cable and so forth, any issues? It's rumored to be 170 amp unit, anyone know?
The 4G isn't BAD, but it was a failure compaired to the 3G.
The 3G is still Fords #1 alternator. Even though they have made it to a 7G, Ford puts the 3G in vehilces to this very day. When they want the best they ever made.
I've never seen any aftermarket parts for the 4G, so I doubt it can produce 170apms.
__________________
Ryan McCormick


Fuel Injection Technical Library
Parts replacement is not auto repair, if you can’t diagnose, don’t open the hood!
Fireguy50 is offline   Reply With Quote
Old 12-10-2005, 11:55 AM   #12
Dustin
Diesel Gynachologist
 
Dustin's Avatar
 
Join Date: Feb 2003
Location: Peoria Arizona
Posts: 12,499
iTrader: (12)
Bronco Info: 2001 F350
Quote:
Originally Posted by Bronco Rob
Am i reading that right, the 93 Bronco's are a straight swap?

yes even without bigger cables....Ive done it ad so has dogonmutt. we have yet to have a single problem with it. granted the bigger cables are better and I do play to rewire it so I can get the most out of the upgrade but as it sits now it works fine and I noticed a huge differnce over the stock 95amp
__________________
Ford Senior Master Technician

http://www.superford.org/registry/ve...x.php?vID=1309
Quote:
"The existence of flamethrowers is proof that someone, somewhere, said to himself, "I want to set those people over there on fire, but I don't feel like walking over there to do it."
Dustin is offline   Reply With Quote
Old 12-10-2005, 02:10 PM   #13
LaNeR88
Always down
 
LaNeR88's Avatar
 
Join Date: Oct 2004
Location: Phoenix, Az
Posts: 958
iTrader: (4)
Bronco Info: 88 Bronco 351W
for a 88 bronc with a 351W i need a late serp alt off ryan's site? and which pulley?
__________________
88 Bronco XLT, 4"Rancho lift, 35's, 5.8L 351W EFI,BW1356,C6, K&N FIPK Ghetto Fabbed, Full 3" exhaust,3G alt swap- SOLD =(
LaNeR88 is offline   Reply With Quote
Old 12-10-2005, 06:30 PM   #14
Bronco Rob
Zombie Hunter
 
Bronco Rob's Avatar
 
Join Date: Jan 2005
Location: The Land of Misfit Toys
Posts: 13,706
iTrader: (12)
Bronco Info: 1993 Eddie Bauer, 351, 5.8 liter V8, somebody come help me put all this junk i just bought on!!
Quote:
Originally Posted by Dustin
yes even without bigger cables....Ive done it ad so has dogonmutt. we have yet to have a single problem with it. granted the bigger cables are better and I do play to rewire it so I can get the most out of the upgrade but as it sits now it works fine and I noticed a huge differnce over the stock 95amp
Not to sound dumb Dustin, but did this get rid of all the irritating "dimming"? It's not noticeable to anyone else, but mostly in the winter, when i have the cab blower on high, with the lights on, and the radio, and then i do something like turn a blinker on, the dash lights and the radio display dim with the blinker. Not enough to make me think i have any other issues than just too much power in use.
__________________
Bronco Rob is offline   Reply With Quote
Old 12-10-2005, 06:39 PM   #15
Slickerthanyou
Currently FSB divorced
 
Slickerthanyou's Avatar
 
Join Date: Nov 2003
Location: Kennywood's Backyard-Duquesne,PA
Posts: 958
iTrader: (10)
Bronco Info: Had a 1990 XLT 5.8L Parting out to buy a '79 by spring 08
Quote:
Originally Posted by Bronco Rob
Not to sound dumb Dustin, but did this get rid of all the irritating "dimming"? It's not noticeable to anyone else, but mostly in the winter, when i have the cab blower on high, with the lights on, and the radio, and then i do something like turn a blinker on, the dash lights and the radio display dim with the blinker. Not enough to make me think i have any other issues than just too much power in use.
I'll jump in here- Yes it did. I had a stock alt and got Ryan's 200amp and there's no dimming issues at all with all accesories on!-Bob
__________________


Broncoless at this time Yip she left me!!
Quote:
Originally Posted by Ranger1 View Post
I beat on it, beat on it and beat on it some more and I have the fork tool in there almost until it can't go in anymore.
Is there a trick to this ?
Slickerthanyou is offline   Reply With Quote
Old 12-10-2005, 06:47 PM   #16
Dustin
Diesel Gynachologist
 
Dustin's Avatar
 
Join Date: Feb 2003
Location: Peoria Arizona
Posts: 12,499
iTrader: (12)
Bronco Info: 2001 F350
Quote:
Originally Posted by Bronco Rob
Not to sound dumb Dustin, but did this get rid of all the irritating "dimming"? It's not noticeable to anyone else, but mostly in the winter, when i have the cab blower on high, with the lights on, and the radio, and then i do something like turn a blinker on, the dash lights and the radio display dim with the blinker. Not enough to make me think i have any other issues than just too much power in use.

I had the same problem, It would only do it at night with the headlights on and blower motor. I would come up toa stop and the dash lights would dim alot. the 130amp took care of most of that, I will still get some dimming but hardly any.

the best part is having the power to run the kc lights at an idle without it putting a huge load on teh battery
__________________
Ford Senior Master Technician

http://www.superford.org/registry/ve...x.php?vID=1309
Quote:
"The existence of flamethrowers is proof that someone, somewhere, said to himself, "I want to set those people over there on fire, but I don't feel like walking over there to do it."
Dustin is offline   Reply With Quote
Old 12-10-2005, 07:39 PM   #17
Bronco Rob
Zombie Hunter
 
Bronco Rob's Avatar
 
Join Date: Jan 2005
Location: The Land of Misfit Toys
Posts: 13,706
iTrader: (12)
Bronco Info: 1993 Eddie Bauer, 351, 5.8 liter V8, somebody come help me put all this junk i just bought on!!
Ryan still sells these right? Look in yer box for a PM man....
__________________
Bronco Rob is offline   Reply With Quote
Old 12-10-2005, 07:43 PM   #18
Clarko
Bronkin' 'Round!
 
Clarko's Avatar
 
Join Date: Mar 2004
Location: Woodland Hills, CA
Posts: 2,763
iTrader: (1)
Bronco Info: 94 XLT 351 E4OD 4" Superlift
Quote:
Originally Posted by LaNeR88
for a 88 bronc with a 351W i need a late serp alt off ryan's site? and which pulley?
Quote:
Originally Posted by Clarko
If you have an 87-92:[/b] you have a 2G alternator. This is an early serpentine style. This can only be replaced with an the following car's alts: narrow-eared non-DOHC Taurus from 96-99, any 94-95 V8 Mustang, 94-00 V6 Mustang , 94-97 V6 T-Bird/Cougar, 95-98 Windstar, & 91-94 V6 Lincoln Continental. The early serpentine car and truck alts on Ryan's site are interchangable but the plug and charge stud are clocked differently to fit the wiring better.
It looks like this:
Since it's a truck, and wont see any more than about 5000 RPMs, I'd get the smallest pulley for the best charge.
__________________
Brian

Click either pic for SuperFord.
Clarko is offline   Reply With Quote
Old 12-10-2005, 08:04 PM   #19
Late Model Man
Registered User
 
Late Model Man's Avatar
 
Join Date: Oct 2003
Location: East bay CA
Posts: 2,344
iTrader: (11)
Bronco Info: '95 351, ZF5, Dana 60s
Will the alts from the 93-96 V8 Econoline, 97-03 V6 Econoline E-Series or F-150, or 95-01 4.0 V6 Explorer or Ranger hook up directly to the alt connector on my bronc?
__________________

SuperFord 95 8-lug Bronco with some stuff...
Late Model Man is offline   Reply With Quote
Old 12-10-2005, 08:52 PM   #20
Clarko
Bronkin' 'Round!
 
Clarko's Avatar
 
Join Date: Mar 2004
Location: Woodland Hills, CA
Posts: 2,763
iTrader: (1)
Bronco Info: 94 XLT 351 E4OD 4" Superlift
Quote:
Originally Posted by Late Model Man
Will the alts from the 93-96 V8 Econoline, 97-03 V6 Econoline E-Series or F-150, or 95-01 4.0 V6 Explorer or Ranger hook up directly to the alt connector on my bronc?
Quote:
Originally Posted by Clarko
Quote:
Originally Posted by Bronco Rob
Am i reading that right, the 93 Bronco's are a straight swap?
With a larger charge cable and megafuse, they are.
AKA yes!
__________________
Brian

Click either pic for SuperFord.
Clarko is offline   Reply With Quote
Sponsored Links
Advertisement
 
Reply

  FSB Forums > Bronco Discussions > 1980-'96 Bronco Tech


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -4. The time now is 09:31 AM.


© 2003-2009 FullSizeBronco.com. All rights reserved