I want to run an 8 guage wire through the firewall on my 2000 ls400 but i am stuck.
I dont know where to put it through and i cant find any existing holes.
Does anyone know where i do this and if u have pics please show me!

 

ls 400 is different from most cars, from gas door on passenger side to ..... !!! okay you can run your cable thru the firewall, location is passenger side. Look straight from power steering fluid reservoir on firewall you will see a grommet where all engine wire come from. u can access this hole from inside behind the glove compartment

 

I needed a hole in my firewall to run a hot wire for the cig lighter. Drilled a hole 2 inches left of where the accelerator cable goes through and it worked perfectly. Drilled the hole slightly bigger and siliconed a small piece of rubber tubing for wire protection, although it wasn't really necessary.