Electrical Alternator not charging after terminator 2 install.

Sfab79 · Aug 24, 2025

Hello all, I did a terminator 2 install on my 91 Fox, and since then my alternator is not charging and no charge light on the dash, I have 130 amp 3G alternator, installed, new PA performance 3G regulator and brushes, I know the charge light is not burnt out because I unplugged the cluster put it on The bench Used direct power to the two wires that go to the amp light. I have power also at the ignition switch, I did replace the ignition switch just to be safe and not be stranded, any help or ideas from anyone would be amazing.

AeroCoupe · Aug 25, 2025

Have you had the alternator checked? How did you wire the alternator?

Sfab79 · Aug 25, 2025

Yes, I have tried three different alternators, and I also have a bench test machine,it worked before the terminator set up, which is quite weird….

AeroCoupe · Aug 25, 2025

Have you checked to see if you are getting 12V+ to the files wire at the alternator?

Sfab79 · Aug 25, 2025

Yes 12v and also have the 4awg wire with fuse being hooked up

AeroCoupe · Aug 25, 2025

Assuming you have checked for voltage on the battery post on the alternator?

Sfab79 · Aug 25, 2025

Yes, 12.0-12.5v

Sfab79 · Aug 25, 2025

The really really weird thing is everything worked fine and I’ve never had this problem before terminator install

AeroCoupe · Aug 25, 2025

Obviously at 12.0 to 12.5V+ it’s not charging. It is in the alternator wiring. I would trace the ignition wire from the dash (after the alternator light in the dash and make sure that is getting to the alternator.

This is a post on how the 3G is supposed to be wire and some common things that cause it to not charge:

Post in thread '3g Alternator Green Wire Trouble'
https://stangnet.com/mustang-forums/threads/3g-alternator-green-wire-trouble.896195/post-9031908

I know that there are two dash harness connectors behind the driver shock tower on a 91. I’m pretty sure both of these connect to the ECU harness but am pretty sure they have nothing to do with the alternator. The alternator wiring is part of the headlight harness.

The headlight harnesses are year specific. Yours is 91-93.

Sfab79 · Aug 25, 2025

Great info, much appreciated! Yeah, I totally feel you, I just threw another alternator in it today brand new, not rebuilt and still the same thing, and it is just extremely strange to me that it worked flawlessly a month ago before I did my terminator swap, It’s definitely left me extremely puzzled because the Terminator is on a totally different system

Noobz347 · Aug 26, 2025

You've probably got a wires that is pinched, or cut, or shorted, or something along those lines. All connectors, switches, splices, and fusible links are suspect, too.

Sfab79 · Aug 30, 2025

Yes fair enough, just very very strange everything was fine before T X install

Noobz347 · Aug 30, 2025

Sfab79 said:
Yes fair enough, just very very strange everything was fine before T X install

You may be the only participant in the thread that thinks that this is odd.

I mean, [lots] of things can happen to wire harnesses and connectors with power plant swaps.

I would imagine that you swapped in the harness that goes with the engine and ECU? So, this harness would be new to the car?

I don't find it strange at all that there could be some wiring gremlins in a project like this. I'd be blown away if there were [no] issues.

Sfab79 · Aug 30, 2025

1000%! I don’t disagree. I just find it strange and weird because I have 6 foxes and four now have the Terminator swap and this is the only one I’ve had trouble with and I’ve done many to my friends vehicles also.

2000xp8 · Aug 31, 2025

I'm slightly confused, its this a terminator X v2 ecu and harness swap or a terminator engine swap?
Don't fully know what a terminator 2 is.

Sfab79 · Aug 31, 2025

Just the version 2 kit from AFM, terminator X

Noobz347 · Aug 31, 2025

Ohhhhhhhhhhhhhhhhhhhh.....

I thought it was a supercharged 3V too.

Sfab79 · Aug 31, 2025

It is charged also,

AeroCoupe · Aug 31, 2025

What, the battery or are you saying it is super charged?

nickyb · Aug 31, 2025

So you've done the term x swaps before and this is the first problem with one???
Murphy's Law has found you .

Electrical Alternator not charging after terminator 2 install.

New Member

lube between the nut and the face. I know my lubes

New Member

lube between the nut and the face. I know my lubes

New Member

lube between the nut and the face. I know my lubes

New Member

New Member

lube between the nut and the face. I know my lubes

New Member

Stangnet Facilities Maint Tech... Er... Janitor

New Member

Stangnet Facilities Maint Tech... Er... Janitor

New Member

New Member

Stangnet Facilities Maint Tech... Er... Janitor

New Member

lube between the nut and the face. I know my lubes

I gotta say i never painted my nuts, Never Ever

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