I would do a 1 wire setup, check the Saturn alternator. Regulates itself and only uses a 0 gauge wire and that's it.

I done this 2 wire mod to my stock alt and it made a significant help in my charging. I'm just wondering if there would be any long term negative effects.

How did you turn your alt into a 2 wire alt? Mainly asking because I have mine placed in he rear of he motor and the fewer the wires I need he better .

I'll look to see which ones you need when i get home, will be tomorrow. Off the top of my head it's the middle 2 wires. I used none of the factory wires I ran my own. The voltage sense wire i ran off a distribution block i have so that it would see voltage drop and the other wire is a 12v wire to excite the alt to start charging, i suppose the factory one there would have been fine but i ran a new one. I also ran a 4ga heavy duty wire off the nut on the back to the battery and added a 8gauge ground to the extra little bolt on the case so that it was grounded really well.

Ok, just checked for ya and it's the two middle wires is all you need.

The two middle ones are those the ones that go to the plug? I will try and take a picture of it if I can later today.

Yes the two middle wires on the 4 wire plug that goes on the top of the alternator.

Also would like to know of any negative effects.

I've been on this 2 wire setup for 3 years! Negatives effects hmmm... no but!
I have gone through 3 batteries since then I don't know if this could be the culpit
Voltage fluctuates a lot cold start and is constant at 14.x no more than 14.3 really but as it warms up the voltage drops al the way to 13.5 and stays there!
And you get the p1500 code as well no CEL for this code tho
Actually I'm in the process of going back to the 4 wire setup again it doesn't have negatives effects but a don't see the advantages either...

I haven't noticed the fluctuations you describe. I see 13.5 at idle and about 14.3 with rpms. I don't think this would be causing your battery issue but I could be wrong. I am contacting an alternator builder for any disadvantages this would have. I noticed considerable gains in the time i've been doing it. Eclipsyco have you went through any alternators in your 3 years on the setup? Wondering if this causes them to go out any faster?

Yamahaulin said:

I haven't noticed the fluctuations you describe. I see 13.5 at idle and about 14.3 with rpms. I don't think this would be causing your battery issue but I could be wrong. I am contacting an alternator builder for any disadvantages this would have. I noticed considerable gains in the time i've been doing it. Eclipsyco have you went through any alternators in your 3 years on the setup? Wondering if this causes them to go out any faster?

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No same alt just 3 batteries and actually my current one is starting to fail too! The fail is that for some reason the batteries will not hold charge as long as they used to and they would even die while cranking the car. Look this could only be me! 1g dsm use 2 wire setup with no problems plus many older cars too but since the 2g is meant to be this way why not, I really would prefer a steady voltages and let the ECU control it, also keep in mind that on my car I have many things that draw big amounts of power (ARC-2, 400LPH pump, 4 gauges specially the wideband, and a sound system nothing crazy but still) and as the voltage fluctuates affects some stuff mostly the pump!

No bad negatives effects. Here the function of the other 2 wires: http://www.dsmtuners.com/threads/id...-e-rear-window-heating.301117/#post-151551266

luv2rallye so you don't think that running in the 2 wire config could cause the alt to have too much output causing problems?

No. Any alt's voltage output is controlled by it's regulator. It's current output is whatever it's load requires (due to the loads resistance) up to the alt's maximum current rating.

Yamahaulin said:

I'll look to see which ones you need when i get home, will be tomorrow. Off the top of my head it's the middle 2 wires. I used none of the factory wires I ran my own. The voltage sense wire i ran off a distribution block i have so that it would see voltage drop and the other wire is a 12v wire to excite the alt to start charging, i suppose the factory one there would have been fine but i ran a new one. I also ran a 4ga heavy duty wire off the nut on the back to the battery and added a 8gauge ground to the extra little bolt on the case so that it was grounded really well.

Click to expand...

Ok quick question, what 12v source did you use for the exciter wire and did you need some kind of diode? I did a wire tuck and eliminated my oil soaked alternator plug. I upgraded to a Saturn 140 amp alternator and wanted to rewire it for the most efficient performance.

I have a nice distribution block that i pull all accessory power from for gauges/fans/msd from. I got my 12v switched power from it. You could use 1 12volt wire and hook it to both wires that way you would get the 12v excite wire and also on the voltage sense wire you would have more draw so it would turn up faster. However i have just recently went back to the 4 wire setup and didn't notice any drop in performance, so i have concluded that running my own heavy duty charge wire and adding a heavy duty ground to the back of the alternator was what really gave me the performance increase.