I am looking to do the big 3 upgrade to my 09 is 250 but can't seem to find the alternator lead to the positive battery terminal. Has anyone done this to their car and can point me in the right direction?

 

I just had it done, but my alarm shop did it for me. Good luck.

 

what exactly is the "big 3 upgrade" ?

 

Definition: the "Big Three" upgrade means improving the current capacity of three cables: 1) alternator positive to battery positive, 2) battery negative to chassis, and 3) engine ground to chassis. Some people replace the factory wiring; others add additional cables to the factory wiring.

It's for better audio.

 

Here is a bit of what I had done. Can't see the rest.

 

^ Dang that looks pretty nice! lol

 

Is it a noticable difference in sound? Will it improve the factory system or is it only for upgraded audio systems?

 

It's meant for upgraded audio systems since they generally put a heavier load on the battery because of the power requirement

 

lol i thought it was a reference to miami

 

At first i thought it was about GM/Ford/Chrysler

 

it isn't noticeable difference in factory system sound. It will let you use more constant power for upgraded audio systems that requires much power of the alternator.

 

that looks really good..do you have pics of your set up?

 

https://www.clublexus.com/forums/lex...with-pics.html

 

do you have the ML sound system or the normal one before installing the new system??

 

back to the main topic of this thread, does anyone know where the alternator lead to the positive battery terminal is located??