Is This A 3g Alt?

billison · Nov 8, 2012

I had a local guy look over my "new" 92 and said this was the upgraded alt.... is it?

please oh please...

mikestang63 · Nov 8, 2012

That's a 2g. Now someone could have rebuilt it with better internals, to run higher amps but they left the stock wiring intact?

Here is a side by side of the 2g and 3g case.

Chuckman · Nov 8, 2012

not a 3g, the fan would be internal, and the white wire on the bottom would have a smaller plug, and there would be a larger power wire.

billison · Nov 8, 2012

Dunno why, but the 3g swap always stumped me till just now... I just gotta get the alt, and the hardware, use the plug, cut the other plug it goes to the charging bolt along with a think wire that will go to the solenoid, and connect the white wire to the stator... Once I get though my needed fixes, this is at the top of my list fallowed by a torus 3.8 fan.

mikestang63 · Nov 8, 2012

Dunno why, but the 3g swap always stumped me till just now... I just gotta get the alt, and the hardware, use the plug, cut the other plug it goes to the charging bolt along with a think wire that will go to the solenoid, and connect the white wire to the stator... Once I get though my needed fixes, this is at the top of my list fallowed by a torus 3.8 fan.

I know this has been beat to death, but IMO do NOT cut any wires. There is no need to. Simply splice into the stator wire on the old 2G wiring with either a female adapter or get the adapter from the boneyard. The D shaped plug from the 2G transfers over to the 3G. Run at least a 4G power wire from the post on the 3G to the battery side of the starter solenoid with an inline 150 amp fuse. Make sure you add another 4G ground wire from the block to the chassis.

billison · Nov 8, 2012

ok, so youre saying leave the original harness and simply splice off the stator wire? what about the other 2?

mikestang63 · Nov 8, 2012

Just tape off those wires and tuck them back. IMO do NOT hook up the2 black/orange wires to the post on the 3G. Those wires are notorious for burning up with only the load from the 2G. I've done dozens of Mustangs this way with no problems.

billison · Nov 8, 2012

what do those wires go to? will not hooking them up do anything? They gotta power something...

HISSIN50 · Nov 8, 2012

billison said:
what do those wires go to? will not hooking them up do anything? They gotta power something...

They were the charge wires for the 2G. Your 3G will have the fused 4 AWG power cable noted above, so these are unnecessary. But if you connected them and your 4 AWG cable blew a fuse or something happened which affected the integrity of the cable (a terminal falls off, etc), power would try to go through those two little wires and that would not be good. As noted, insulate the ends of those two wires really well (they're still connected to battery power on the other end).

billison · Nov 10, 2012

this honestly just makes the whole install easier, it's just installing the alt, installing the new chargle cable with fuse and the stator... this is on my to do list.... right at the top.

mikestang63 · Nov 10, 2012

If you get a large case 3g from a 1994-2000 mustang, you will need to notch the alternator bracket to get the alternator to fit. Mark the part of the bracket with a marker and you can use a dremel, a grinder, or even a small hacksaw. You'll see what I mean when you put the bottom bolt in and swing the alternator in. Also, the stock top bolt won't work. You'll need a new bolt and nut. I forget the size but am sure others will chime in.

billison · Nov 10, 2012

Yeah, that stuff too. I was being lazy with my typing.

billison · Nov 11, 2012

I guess my final question before I start gathering parts is this, my ground needs to be replaced with a 4g wire, Do I just run a wire from the block to the battery or do I run it to where the ground on the battery connects to the frame? thanks.

HISSIN50 · Nov 11, 2012

If you like, you can run it from the engine to the ground location adjacent the windshield washer reservoir and battery.

mikestang63 · Nov 12, 2012

Yep, that's where I ran mine. You can also add it to the ground strap on the back of the engine to the firewall. Can never have too many grounds IMO.

If you like, you can run it from the engine to the ground location adjacent the windshield reservoir and battery.

Mustang5L5 · Nov 12, 2012

mikestang63 said:
Yep, that's where I ran mine. You can also add it to the ground strap on the back of the engine to the firewall. Can never have too many grounds IMO.

yes you can. Too many grounds creates ground loops.

When in doubt, ONE good solid ground beats many grounds.

mikestang63 · Nov 12, 2012

yes you can. Too many grounds creates ground loops.

When in doubt, ONE good solid ground beats many grounds. Mike

Maybe I'm misreading your post. First time I've heard of only having one ground wire in 30+ years. Stock, they come with several grounds that I can think of

1. main power ground is from engine block to neg post on battery for starter and alt.
2 secondary power ground is between the back of the intake manifold and the driver's side firewall for accessories, a/c and interior.
3. ECU has its own ground split off the neg battery cable
4. ECT, VSS IAT, TPS all have their own grounds
5. TFI has its own ground
6. HEGO orange ground for the )2 sensors from harness by the salt and pepper connectors the firewall

If you have a trunk mounted battery, you also have a ground back there. Electric Fan or water pump? Another ground. In theory, one ground wire for everything would be great. I don't see how you do it but you're never to old to learn something.

Mustang5L5 · Nov 13, 2012

That's different.

I think did misread your posts. What i was referring to was the current trend in the import world to basically ground the hell out of anything and everything...like so.

What you are referring to is proper grounding technique. But tossing on 3 engine to body grounds just because there was an empty lug is a different story.

mikestang63 · Nov 13, 2012

Mustang5L5 said:
That's different.

I think did misread your posts. What i was referring to was the current trend in the import world to basically ground the hell out of anything and everything...like so.

What you are referring to is proper grounding technique. But tossing on 3 engine to body grounds just because there was an empty lug is a different story.

LMAO!!! That is some funny shiiiiit... Between the fart tubes, 10 foot wings, neon lights, 8000 stickers that add 100hp, fire extinguishers, 1000 watt stereos, lambo doors, and NOS bottles that arent hooked up (nitrous oxide to us old timers), they take stupid to a new level.

Try and beat this one....

Is This A 3g Alt?

billison

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GTFO you fat, heavy bastard

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"How long does it take to get help in here?

billison

I like tinted tail

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I like tinted tail

billison

I like tinted tail

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"How long does it take to get help in here?

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Mustang5L5

That is…until I whipped out my Bissell

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That is…until I whipped out my Bissell

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Is This A 3g Alt?

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"How long does it take to get help in here?

I like tinted tail

I like tinted tail

I like tinted tail

"How long does it take to get help in here?

That is…until I whipped out my Bissell

That is…until I whipped out my Bissell

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