Engine 3G alternator issues

General karthief · May 12, 2020

CUAviator said:
Why does everybody keep calling it a truck? ‍

That's me, I monitoring two threads with alternator problems, one is a truck, sorry.

CUAviator · May 12, 2020

90sickfox said:
I think its auto correcting to truck from " trunk "

Ahhh!!! Now I can’t stop laughing

Blown88GT · May 12, 2020

Simple visual alternator test:

External fan - 2G
Internal fan (not visible) - 3G or later

There are some 2G's out there that are "upgraded" 2G's with higher output.
I've heard them referred to as "1-wire alternators".
1-wire refers to one power wire for the alternator output.

All 3G's are 1-wire (plus one or 2 connectors for the voltage regulator)

CUAviator · May 12, 2020

Blown88GT said:
Simple visual alternator test:

External fan - 2G
Internal fan (not visible) - 3G or later

There are some 2G's out there that are "upgraded" 2G's with higher output.
I've heard them referred to as "1-wire alternators".
1-wire refers to one power wire for the alternator output.

All 3G's are 1-wire (plus one or 2 connectors for the voltage regulator)

That’s part of my issue - I don’t have anywhere to connect the “voltage regulator” connections.

General karthief · May 12, 2020

Just to clear things up, what year mustang is this, I read back and it's not mentioned.

CUAviator · May 12, 2020

General karthief said:
Just to clear things up, what year mustang is this, I read back and it's not mentioned.

1965.
302 crate motor (Fox body).

General karthief · May 12, 2020

Well, that clears some things up. I think we need to get you over to the classic forums, our stuff (fox body) uses an internal regulator and the early models has an external regulator so the advice given here may not apply and we don't want any unintended fires. Give me a minute and I'll get a thread started for you over there.

General karthief · May 12, 2020

I started a thread in the classic tech forums, here is a link:

Electrical - Ford crate 5.0 engine in a 65 stang / alternater problem

Need help with wiring for the build, recommendations for wiring or maybe a different alternator choice. 87DIB5.0 Member Jun 9, 20182331339Houston Mar 7, 2020 Add bookmark #1 I am having issues with my alternator not working. I have a 3g alternator with a 4 gauge wire running to the starter...

www.stangnet.com

Go there and post the pics of your alternator and the wiring and lets see what the members there think.

CUAviator · May 12, 2020

General karthief said:
I started a thread in the classic tech forums, here is a link:

Electrical - Ford crate 5.0 engine in a 65 stang / alternater problem

Need help with wiring for the build, recommendations for wiring or maybe a different alternator choice. 87DIB5.0 Member Jun 9, 20182331339Houston Mar 7, 2020 Add bookmark #1 I am having issues with my alternator not working. I have a 3g alternator with a 4 gauge wire running to the starter...

www.stangnet.com

Go there and post the pics of your alternator and the wiring and lets see what the members there think.

Awesome, thanks. It’s just that since I’ve had this car, everyone has said that anything related to the engine (including my painless electrical) should be matched to the Fox engine. Is that not the case?

KRUISR · May 12, 2020

The charging system needs to be compatible with your chassis (rest of the car) except for whatever power requirement are needed for the fuel injection.

For example, if you have electric fans, the charging needs to be sufficient to support that.

If you wanted to do a 3G conversion that would give you plenty of juice and should be to be adapted to your car pretty easy. Personally I used an alternator and wiring pigtail from a 94-95 V6 mustang and modified/added to it to make it work in the Fox. They should be a 130amp alternator. I used a positive cable from a Windstar/Freestar as they are similar output alternators and use a larger gauge wire and the factory cable goes from passenger side of engine compartment to a driver front corner battery (much like the Fox body) so it is long enough.

Another vehicle that used a compatible 3G alt is the early 2000's Taurus. One difference is the voltage regulator is clocked differently on the back so it is pointing down (if I remember) which actually helps if you want to hide the wiring. A bit of a pain plugging it in though.

Adieu · May 13, 2020

CUAviator said:
voltage regulator checked OK...UNTIL I turned on the AC, headlights, and stereo. At that point, the battery and alternator were reading ok but the voltage regulator FAILED (at both shops).

A) does anyone know why that happen?

Have this test re-run, but ONLY turn on the A/C, not the lights and radio.

If the alternator and/or regulator test bad with the A/C on and test good with it off, it's usually a bad A/C compressor clutch coil.

CUAviator · May 13, 2020

74stang2togo said:
Have this test re-run, but ONLY turn on the A/C, not the lights and radio.

If the alternator and/or regulator test bad with the A/C on and test good with it off, it's usually a bad A/C compressor clutch coil.

Will do.

KRUISR · May 15, 2020

CUAviator said:
Me neither. But I’ve never seen it any other way either.
How is it supposed to be different? And does it matter?

Stock 90 Fox idle pulley location with smog pump and A/C...

It shouldn't matter, so long as proper tension is maintained.

Engine 3G alternator issues

General karthief

wonder how much it would cost to ship you a pair

CUAviator

Member

Blown88GT

CUAviator

Member

General karthief

wonder how much it would cost to ship you a pair

CUAviator

Member

General karthief

wonder how much it would cost to ship you a pair

General karthief

wonder how much it would cost to ship you a pair

Electrical - Ford crate 5.0 engine in a 65 stang / alternater problem

CUAviator

Member

Electrical - Ford crate 5.0 engine in a 65 stang / alternater problem

KRUISR

Adieu

Easy there, this ain't a dating site.

CUAviator

Member

KRUISR

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Engine 3G alternator issues

wonder how much it would cost to ship you a pair

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wonder how much it would cost to ship you a pair

Member

wonder how much it would cost to ship you a pair

wonder how much it would cost to ship you a pair

Member

Easy there, this ain't a dating site.

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