3G alternator FACTS (its wins agian!) - Page 19 - Ford Bronco Forum
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post #361 of 377 (permalink) Old 01-14-2015, 09:53 PM
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Your truck already has a 3G.
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post #362 of 377 (permalink) Old 01-26-2015, 02:09 AM
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MORE POOWER

So I found out I have a 3g alt. but it is only a 95amp, I was wondering what if any ford I could pull a 130amp alt out of? I will go to the junk yard for the core and get the bigger one new if its possible... also would I need to change anything in order for this to work. Thanks again guys

Last edited by Fyrmn1979; 01-26-2015 at 02:11 AM. Reason: additions
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post #363 of 377 (permalink) Old 02-14-2015, 07:54 PM
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Did the 3G swap today. Pulled the alternator off a 96 V6 tbird @ the JY, snagged the harness and mega fuse with it. Reused/adapted the vr plug/wiring, and ran my own 2awg welding cable for the charge wire. Reused the mega fuse w/ a Bussman fuse holder.

Worked out great! Charges @ 14.4v with all electrical maxed out.



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post #364 of 377 (permalink) Old 09-20-2015, 12:17 AM
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Does anyone know where the tach wire or terminal is? I've done allot of searching and they all say the 3G has tach out put, but where?

Check out my "Molasses Project"http://www.fullsizebronco.com/forum/showthread.php?t=197652
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post #365 of 377 (permalink) Old 11-06-2015, 04:25 AM
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Quote:
Originally Posted by Sixlitre View Post
You're preaching to the converted Ryan !

Nice work on the photos ! I'd say the 3G swap was the single best mod I've done to my 86 ...period.

It was also a virtual bolt on for us V-belters.

Nice to see the proof though

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--------------
Yes the mustang 3G will work. I have done this swap and have pictures I can send you if you shoot me a private question. However you will need to do some minor modifications to allow it to physically fit as the 3G uses a larger casing.
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post #366 of 377 (permalink) Old 01-05-2016, 02:44 PM
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I'm trying to find the one that will fit the v belt motor. Every one I find has the serpentine flat style pulley. Do you have to swap the pulleys?

jknc '87 Bronco 302 4x4
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post #367 of 377 (permalink) Old 01-12-2016, 09:22 AM
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I had to go with a stock one for now. I couldn't find a 3g with a v belt pulley. I am going with 6 gauge wire for when I do the 3g swap in Spring.

jknc - '87 Bronco w/ '80 302
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post #368 of 377 (permalink) Old 03-04-2016, 09:05 PM
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Which regulator?

I purchased an alternator from Fireguy a few years back, and recently after starting my 94' Bronco, the volt gauge maxed out and blew out my headlights. I replaced the alternator with one from a ford van (not sure of the model #, but is the same 3G case). I'd like to get the Fireguy alternator working again, but am not sure which regulator (I assume that's what went wrong) to buy. Would this one work?

Amazon.com: Voltage Regulator for Ford 3G Alternator w/ Brush Holder (Heavy Duty): Automotive

Any other links to good regulators?

Scott

1994 XLT 5.8
Rear Eaton E-locker/4.56 gears-TSM rear discs
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post #369 of 377 (permalink) Old 03-29-2016, 04:18 PM
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Originally Posted by IIVIIoonshiner View Post
i know that steering gears have an aftermarket king (redhead)

is there an aftermarket king for alternators? $$ no object
Not sure if aftermarket kings but I got mine from here, Alterstart. I got a 250amp. Great guys, easy to work with and helped me out. Make sure they include the extra shims since the pulley is smaller.



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post #370 of 377 (permalink) Old 05-13-2016, 11:05 AM
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I have a 1992 Bronco now.. I did this 3G upgrade on my previous 1988 Bronco.

The pics are gone from this thread (lol) so, I am not sure what I am looking for again. I don't think I have a 3G in my rig already, so...

Anyone with a 92-96 do this upgrade?

If so, any information would be great.

Thanks in advance.

1992 XLT, 5.8 w/ E40D transmission, TTB D44 in front, 8.8 rear, 4.88 gears w/ Eaton Posi, Gibson exhaust/headers,cb radio, 4" suspension lift, 33x12.5's on 8" Pro Comp wheels.

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post #371 of 377 (permalink) Old 09-29-2016, 05:46 PM
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i have a 1990 with a 4.9l in it and i cannot find how to do this alternator upgrade or what alternator will bolt in would someone be willing to help me please
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post #372 of 377 (permalink) Old 03-21-2017, 11:25 AM
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Picked up a 130amp Alternator for something like $70 a few months ago, absolutely loving it!

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post #373 of 377 (permalink) Old 05-11-2017, 11:42 AM
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I put in a 3G for a 95 T-bird that I bought re-man for ~$75. The old pulley fit too loosely on the new alt. shaft and there were interference issues that would require shims and stand-offs to get it right. Rather than horse around with that I just bought a new stock pulley for the T-bird alt. Pulley goes right on using the old nut, a little grinding gets the larger case alt. onto my 302 and a little wire harness fabrication and fuse mounting later everything is in place. Works great, charges nicely even under load, but now there's a belt squeak. Almost always a loud squeal on start up and a consistent squeak for the first 10 minutes until everything gets nice and warm. I put on a new Motorcraft JK-6916B belt and had no change at all.

The new pulley is ~2.75" in diameter where the old one is just over 2". After doing a little basic trigonometry I figure I've added about 0.75" of extra belt length because the belt only contacts about 1/4 to 1/3 of the alt. pulley. [delta Circumference = pi * delta Diameter * proportion of contact] if you're keeping score at home. Also the alt. pulley is now in a slightly different location which probably adds 1-2" of belt travel. For the record the tensioner is not maxed out and I'd prefer not to replace it because I'm a cheapskate. I'd rather just put on a slightly longer belt, but how much longer?

I'm thinking of getting a JK6-936, 2" longer. From what I gather the first digit means 6 ribs, the next two, 93, means 93 inches and the last means 8ths of an inch, as in 93 and 6/8 all together.

Would anyone like to chime in, hopefully steer me straight?

This too shall pass
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post #374 of 377 (permalink) Old 05-12-2017, 06:12 AM
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If you change belts go to NAPA and get a Gates Green Stripe Belt. Much better than the Motorcraft belt. If you can increase the amount of pulley contact the better.
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post #375 of 377 (permalink) Old 05-12-2017, 04:56 PM
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Ok, after my Autozone "lifetime" alternator quit for the forth time, I've decided to up grade. Mine never has worked good since installing the e-fans. I guess it just can't keep up at idle.

Anyways, I have a 3G that I installed on my project truck. It was from a Taurus. I'm thinking of getting another for my Bronco. It would be nice if both vehicals ran the same alt.

On the 3G, there is only one plug (to the regulator). There is also "tab" (male spade) and the charge post. The plug looks just like the regulator plug on my Bronco stock alt. My stock alt doesn't have a charge post, just another plug. I'm assuming the charge wire is on that plug. So I'm thinking of making a heavy duty charge wire that goes right to the battery selinoid. If I have that and the one regulator plug, will it work? Do I need to go into that other plug and connect any of the wires? What are the other wires? Will my tach still work? How about the computer?

Also, people mention a "fuseable link". Is that really nessessary?

Check out my "Molasses Project"http://www.fullsizebronco.com/forum/showthread.php?t=197652
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post #376 of 377 (permalink) Old 05-15-2017, 08:32 PM
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I did the 3g swap years ago in my 88. but I've never seen more than 14.2v and that's on cold start.
Warm at idle and everything on, 13.6v
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post #377 of 377 (permalink) Old 05-25-2017, 03:51 PM
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I went ahead and put on the Motorcraft JK6-936 belt, two inches longer than stock. This put my tensioner almost all the way to one extreme and cleared up almost all of my belt squeal. I'll probably put on a JK6-926 next time I need a belt.

This too shall pass
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