100A 1G alternator

Haven't done it personally but yes the OEM wire is inadequate.

Does the 100A alternator output run through the regulator?
Or do you wire the output to the battery plus terminal?

Why 1g? IMO you would be better offf going 3g and eliminate the external VR. The 3g conversion is a very simple mod on the old Mustangs especially if you have upgrade electronics and accesories in your vehicle.
A new output cable is needed from the alt to the battery, I got all of the reqiured wireing from a 96 Taurus at a salvage yard for free.
The 3g has as more output at idle than your original alt. wide open.
I just finished doing this on my 68 which really needed it. I have pwr windows, doorlocks, electric fan, Crane ignition etc.
The 3g IMO is the only way to go as long as you are not concerned about authenticity.
Do a search on 3g and you will have enough reading for a day or so on the conversion.

<font size=-1>[ This Message was edited by: kechke on 4/14/06 11:26pm ]</font>

<font size=-1>[ This Message was edited by: kechke on 4/14/06 11:27pm ]</font>

I looked into the 3G and found that many people feel that the 1G has a better reliability record.

I also wanted to retain my stock ammeter...


<font size=-1>[ This Message was edited by: Mpcoluv on 4/15/06 12:49am ]</font>

IF YOU ARE GOING TO USE YOUR PRESENT AMMETER, I WOULD ASK YOU TO THINK OF NOT DOING IT. IF YOUR CAR IS IN NEED OF 100A., THAN TRY TO FIND A VOLTMETER TO FIT IN THE STOCK DASH. TODAY AMMETERS ARE NOT USED BECAUSE WHEN THEY GO OUT AND THEY WILL, YOU GO NOWHERE. I HAVE BEEN WORKING ON CARS ALL MY PROFESSIONAL LIFE AS A FUEL AND ELECTRICAL SPECIALIST AND SEEN WHAT AN AMMETER CAN CAUSE. I AM PRESENTLY BUILDING A CLONE T-BOLT AND I AM USING A 3G ALT. I PUCHASED IT FROM PA PERFORANCE WITH A WIRING KIT TO WORK WITH MY NEW HARNES I MADE.

I have a 100 amp alternator on my '82GT. I don't know if it's a 1G or 2G but I know it's not a 3G unit.
Mine is a Powermaster unit with a built-in regualtor. I ditched the external one then. Mine is the one wire hook up. I run a 4gauge wire from the battery side of the selenoid to the alternator and that's it!

Ditto what 82GT said, except I'm using the 140A model on my Bronco.

"I looked into the 3G and found that many people feel that the 1G has a better reliability record. "
This is not true, The 3g is every bit as trouble free as the earlier generation alternators besides being more efficient.

"I also wanted to retain my stock ammeter... "
You can, as I stated previously, do a search on 3g and you will find a schematic on how to uase your original ampmeter

The 3g is not a true "1" wiire alternator it needs an external 12v source to get it started.

Another alternative is to go with a voltmeter instead of a charge indicator, most new vehicles do !

Here's a link that should be useful
http://www.oldengine.org/unfaq/3ag/3ag.htm

A voltmeter is a lot more useful than an ammeter