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Discussion Starter · #1 ·
Have any of you guys installed a 100A 1G alternator on a old mustang with an external regulator?
What wiring changes are required?
Surely the power output wire is from a 40A harness/plug is too small for the 100A alternator.
 

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

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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>
 

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Discussion Starter · #5 ·
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>
 

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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.
 

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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!
 

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"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 !
 

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A voltmeter is a lot more useful than an ammeter
 
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