westTEX26

I need to know, 09 LS2 out of trailblazer SS if that helps.

Thanks

bad67ls

iTrader: (2)

i asked the same question a few weeks ago but about an 07. just run the heavy 12 lead to the main lug on the back and your done.

westTEX26

So its pretty much a 1 wire

bad67ls

iTrader: (2)

exactly. the other wires off the 2 pin connector go to the pcm, which we dont have. it charges fine without them.

westTEX26

Sweet thanks for the info!

bad67ls

iTrader: (2)

no problem (tips hat)

1970camaroRS

iTrader: (8)

09 Trailblazer doesn't have an excitor wire?

toxic99

Have to double check mibe when I get home but, pretty sure ya put 470 ohm on brown wire and run to switched ign. Other wire leave hanging.

1970camaroRS

iTrader: (8)

Did some more poking around and it appears the 2 pin late model alternators don't need anything connected to either of the pins to charge. Very interesting...

bad67ls

iTrader: (2)

it does charge, but not as well as i hoped. my car is very basic and doesnt have alot of amp load...all grounds are actually probably more than needed and it seems to drop off voltage alot with not all that much load. seems almost like there is no feedback to the alt to tell it to ramp up then a load is present.

westTEX26

This one does, it might be an 08 tho. It has the conecter and the power stud.

bad67ls

iTrader: (2)

its a 2 pin connector not a 4. the consensous was wire it like a single wire when i posted this question. i think mine is in the conversions and hybrids section.

1970camaroRS

iTrader: (8)

Found it here: https://ls1tech.com/forums/conversio...lternator.html

Found the answers interesting. Some saying don't wire it and they run it that way just fine. Others saying wire it. Then someone says you can't wire it the same as you would a 4 pin. Bumped that thread up to see if we can get more answers.

bad67ls

iTrader: (2)

problem is, i dont think anyone knows for sure lol. ive been driving my car around for about a month with it set up single wire and it works, just not as well as i had hoped.

westTEX26

Well if it works it works lol

bad67ls

iTrader: (2)

Like i said though,it doesnt seem to ramp up under load.

1970camaroRS

iTrader: (8)

What does it do under WOT? Does the voltage drop as the RPM increases?

bad67ls

iTrader: (2)

not that i have noticed...

but if you turn on say...the turn signals,headlights and blower motor it drops hard and stays down. never dropped much with the old cs120 alt in it.

1970camaroRS

iTrader: (8)

Is that just at idle or at all speeds? If at idle, sounds like it's not spinning fast enough. If at speed, you might have a bad ground or something causing a lot of resistance. Sounds like the alternator itself is working fine.

bad67ls

iTrader: (2)

at any speed. and no way there is a bad ground. i just built the whole car over a month ago...there is 0 gauge grounds everywhere lol