Technical Cable through firewall

[Petersto]

Does anybody know how to get a cable from the engine bay to the interior fuse box. There is a grommet but I think that it comes out behind the fireproof material. Anybody have any ideas (and ideally pictures)?

Trying to run the cable though the existing main harness is very difficult as it bends at a right angle and access is hard.

 

[2668GRIFFIN]

Ok this is what i did
If you open the passenger door and look at the hinge end from the out side you will see a grommet,[after removing the interior panel you will see the grommet] with the door still open from inside the cab look through the door hinge up in side the wing and up the top of the wing is a large gap into the engine bay.
I bought some convoluted trunking and ran it that way
LUIGI

 

[nedro018]

my 2013 has a 2 inch X 1.5 inch rubber grommet on the driver side which i sliced marginally to feed a wire to a solar battery charger inside thats charges direct to the battery via a regulator. its located under steering wheel midway down firewall. sorry no pics, its nighttime....

 

[QuboTastic]

this is helpful... I've got to instal an underseat subwoofer and it requires a yellow fused power cable to be run through to battery... was worried how difficult that would be on my 2009 qubo...