Lexus GS alternator swap mod?

[Eicca]

So I had the alternator out of my 1998 GS400 the other day, and I compared it to the alternator I took out of our 1999 LC. They look identical. Rear plugs are the same shape.

The GS alternator is 100-amp. The LC alternator is 80-amp if I remember right.

The only thing I don’t know is the pinout. If the terminals are the same, then what’s stopping us from using the Lexus 1UZ alternators in the LC?

The 3UZ alternators may interchange as well.

 

[Njck22]

I was thinking about this the other day as well. But seems there is little to be gained by using one. New OEM for any uz engine is discontinued or costs $900+ from overseas. Only rebuilt or new low-quality ones are available, which is the same story on our alternators.

 

[MongooseGA]

Later model 100s came with 100A alternators.

I think even later ones came with 110A

If I'm not mistaken, they should go right in. No guesswork required.

 

[cmck]

The pin pattern is stamped on the outside of the factory housings. I put a 2007 130amp into my 99lc last month. In my case I had to switch the connectors due to the tundra being different.

Here’s what the pin drawing on my 99 looks like.

 

[cmck]

The pin pattern is stamped on the outside of the factory housings. I put a 2007 130amp into my 99lc last month. In my case I had to switch the connectors due to the tundra being different.

Here’s what the pin drawing on my 99 looks like.
View attachment 1855323

View attachment 1855322

Opps the second image is the tundra.

 

[Eicca]

Well I can confirm this doesn’t work. The positive wire post on the LC alternator is a smaller diameter than the GS one. I looked at taking it apart to swap that little bit but it seems to be integrated with a whole bunch of other stuff in there.

Found this out when my GS alternator farted out and I thought “hey no problem, I’ve got that spare LC alternator kicking around.” NOPE.