.boB

iTrader: (1)

Transplanting a 2001 LS1 into something non-GM. I'm using a Megasquirt ECU and a custom wiring harness.

The alternator plug has only one wire. Is that the exciter wire for the internal voltage regulator? That's usually controlled by the ECU. Does it need 12v? or 5v?

gMAG

iTrader: (1)

Bob, yes that is the exciter wire. I believe that the control voltage is a range up to 5v.

.boB

iTrader: (1)

If it's less than 5v, I can run an output from the ECU.

If it's 6v or higher, I can use a keyed circuit and a ballast resistor. Which I like better. Alternators can be noisy, and when they start to go bad they can make nasty spikes and surges, which could damage the ECU.

Any idea on how many amps that circuit draws?

gMAG

iTrader: (1)

Bob,
Here's an update/correction of my answer.
With the 98, I haven't seen anything over 5 volts. However, this is not the complete answer, nor does the same LS1 alternator wiring apply to every year.
Read this for more exact info, and note the discussion of a resistor, or sometimes, a ballast lamp.
Sorry, I had forgotten the particulars.

https://ls1tech.com/forums/conversio...d-voltage.html

Glenn

.boB

iTrader: (1)

Pretty interesting; thanx.

I had read about the resistor. But I also read of some failures, and a voltage reducer was more reliable. A 12v to 6v reducer is cheap and readily available. I just don't know! By the time you read for an hour, one thing contradicts the other and it all becomes a blur.

Anybody know how many amps this circuit draws?

gMAG

iTrader: (1)

I wish I had a dollar for every incorrect part I bought, as a result of contradictions.
I didn't see an answer for the amps/milliamps question.
If need be, email John @ Speartech.com. He is the electric gooroo around here, and a sponsor.

Glenn

.boB

iTrader: (1)

Thanx, I'll do that.

Hi-Po

iTrader: (4)

I soldered in the resistor and it works great, after frying one without it lol.

Not much time on it, though. The resistor was probably 3 dollars for a 3 pack. I'm using a Holley Dominator, might be different.

I'll ship you one of my extras for free!

.boB

iTrader: (1)

Thanx for the offer. I'm leaning towards the in line resistor. It's an easy modification, and I have a couple of them left over from a previous project. I think they came in a 5 pack.