1G Putting a 2g alternator into a 1g

[4gfun]

I know that there are 2 wires for the 1g alternator and 4 wires for the 2g alternator.

How would I get a 2g alternator to fit into a 1g and work?

I am not going to bore you with what I am trying to accomplish, but it is important for me to try and figure this out.

Thanks!

 

[Codester]

It does work but I dunno to what extent. Somebody thought that a 1G alternator was needed on my old 2g talon's 6 bolt swap. They cut the two wires and soldered the two needed wires to the 1g plug so it could work.
The 2g alternator has the other two connections for the regulator and ECU connection. If it needs those signals to work then this is a bad idea since the regulator won't run right. If that makes any sense.

 

[4gfun]

It does work but I dunno to what extent. Somebody thought that a 1G alternator was needed on my old 2g talon's 6 bolt swap. They cut the two wires and soldered the two needed wires to the 1g plug so it could work.
The 2g alternator has the other two connections for the regulator and ECU connection. If it needs those signals to work then this is a bad idea since the regulator won't run right. If that makes any sense.

Plenty....with all of this alternator hassle, I am scared to risk it!

 

[luv2rallye]

The 2g has an alternator (alt) with 4 wires instead of the 1g's 2 wires. One of the extra wires (green wire - "FR signal") is an internal alt load sense line signal to the ECU which controls idle speed (IAC) when extra electrical loads are present on the alt. The other (white wire - "G signal") is a control signal from the ECU to the alt which forces the alt to output 12.5V maximum. The ECU sets this signal when it determines it needs maximum/more hp (eg. WOT) so the alt won't use hardly any hp thereby providing more to the drivetrain.

 

[mitsubishikid]

I know this is over a decade old but figured i would share my diagram in case other people want an answer on how to wire a 2g alternator to run in a 1g dsm, blue to blue, green to green, red wires not used if just looking to copy the stock 1g setup, but luv to rally vary well explained that we could wire it so it could be cut off under certain situations which might have practical use on a 1g.

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[mitsubishikid]

I located a male side 1g alternator pigtail off of an infiniti J20, and made a adapter harness using a 2g pigtail on my car so i can use 1g or 2g alternators now.

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