Last night was mostly spent trying to work out how to run a power cable from the battery to the boot without drilling any holes. Here's the results...
I used about 5m of 4gauge cable, which left me with over 1m spare when I reached the boot.
Step One: Locate the grommet
The grommet that I sent the cable through into the engine bay is on the drivers side, loosely indicated by this picture:
The easiest way to do this is to find something long, thin, and if possible, sharpish. I used a straigtened bucket handled and sharpened one end slightly with a grinder!
It is best to start from the drivers side footwell and, with a torch, look up behind the dash and follow a 'pipe' through. It's easier shown on this photo:
To help orientate yourself with this pic, the black shelf is the underside of the shelf below the steering wheel. The silver thing, with one end highlighted in yellow, is what i used to pierce the rubber grommet.
Step two: Get the cable through
Slowly push your long thin tool (ahem) through the grommet, being careful not to hit anything else, although I don't think there is anything weak in this area. Also, don't push/pull it the whole way through. It should exit into the bonnet as shown in the next pic:
again, to help with bearings, the grey bit going across the top is the rubber seal which the bonnet rests on, and the round black thing is about level with the steering wheel 'ish'.
Now attach your power cable to the interior side of the rod that is poking through the grommet. Gently pull the rod from the engine bay side until the wire comes through. You can now take the cable off and buy a new bucket
I found that the easisest way to get it to the battery is to send it behind the plastic panels so that it comes out behind the battery box. Basically following the brown-green brake pipes. I haven't got a picture of the wire connected to the battery, so I just doctored one...
Step three: Going to the boot
Next, I took off the rubber door seal and and grey plastic panel next to it. This is just held on with clips. I sent the wire behind the bonnet catch lever and down the gap in the panel.
I continued along this panel to the end of the door. The next step was to gently prise of the rear side panels. This only has to be done a little bit as you will be sending the wire along the top, following just below the window ledge. You may want to attach the wire to the side with some tape, if only to avoid it touching and perhaps damaging the rear speaker whilst you are still fitting it.
The wire should now be in the boot area. There are two ways to get the wire into the boot. You can either take off the access panel and send it through there, or send it under the main panel and carpet to keep it hidden. I chose to send it through the access panel as this will be hidden with my boot install anyway, although under the main panel would be best if the amp is going in the spare wheel holding place. Be careful the amp isn't too covered down there and overheats though!
And there it is, the wire is in the boot. The easiest place to earth the amp is probably on the boot latch, as this is not covered in paint. However, sanding away some paint in the spare wheel holder may be better for you, depending on your circumstances.
I hope that explains is well enough, the whole thing took me a good 3 hours, but that was with trying to find a suitable grommet and lots of cursing and general farting around. It should take between 30 minutes and an hour.
Any problems, don't hesitate to ask!
Dom
How to power an amp without drilling holes 
