I was sort of fed up with the tutorials i have seen on how to wire things up for the Fit.
So i was taking photos of what i was doing to get my system setup. Sadly i haven't completed the whole thing, and need to rewire the trunk area so that i can make the speaker wires easier to unplug (using banana plugs) and somehow make the power cables easier to unplug and hide when needed, and still be safe (some sort of cap maybe)
Either way, here it starts.
My engine bay, this is what i had to work with.
My choice was to go as close to the hood as possible, following the ECU cable harness as a way to hold my power cable.
So...
Step 1, get the power cable laid to the trunk (or where ever you want to have the amp, mine just happens to be in the trunk. First you need to get it through the firewall, without cutting into the walls, on my car (2007 Honda Fit USDM) i was unable to get the power cable to go through the original funnel rubber thing, and HAD to cut it(only choice i had, really....)
So, i used a hanger to get through the funnel, and this was how i attempted to get my power cable through, but failed.
First i had to peel back the electrical tape holding it all together.
Then i passed a hanger with lots of electrical tape to protect my ECU harness from being cut by the hanger end.
Then with a razor blade, and some pulling force to stretch the rubber funnel, i began slitting the funnel against the hanger (so as not to cut into the wire harness. I repeated the slitting till i cut all the way through, and there was enough space under the hanger to pass the power cable.
Then pass the power cable through and catch it on the other side.
since i had prepped the area already by removing the glove compartment and the foot heater (links will be added later) i could easily catch the cable
but then my neat freak senses were tingling, and i didn't like the fact that i was running the power cable in between all the different ECU connectors, so i re routed the power cable to go through under that mess =P
Then i had to start passing the power cable under the floor boards, starting with the first one, i personally tucked it in, then i managed to pop off the whole floor board by accident.
Kept on going through the floor boards, but i hit something nasty, i couldnt manage to fit my really thick cable between this really tight spot, and knowing myself, i love to get into really tight spots <3
I ended up popping off the whole column
And continued to run the cable.
(CAUTION CAREFUL WITH THE YELLOW MARKED PLUGS!!!, read your manual on why)
Then i found another tight spot after this part, but when i noticed that it was bolted down with the passenger side rear passenger seat belt, i didn't want to mess with that. (yet) so i just ran it as close to the wall as possible.
And since i didn't want this wiggling around, i strapped the power cable to this orange thing, which i will assume is for the passenger side brake sensors? not sure, but be sure to NOT unplug this. but this was the only spot i could find i could strap my power cable to and make sure it didn't slip.
Then i proceeded to plug in my new power cable to the Power Block i had.
(NOTE: i never plugged in the other side, that's because i'm not ready to, but i secured it to the power steering fluid container to make sure it didn't slip or jump around during normal driving.
Now, the second part of this is to get the Hi Lo Converter installed, there have been two ways to do this, and i did it the extremely hard way because i wanted to get acquainted with the back side of the stereo for my next tutorial (Ipod Video with charger all in one cable and LCD screen on center ceiling console).
The two ways are:
Connect in the halfway point to the Rear channels, left or right rear. Those are easy, but only if you want one channel to go through, lots of newer songs (e40) have stereo sound for the subs, you feel only one channel instead of both at once if you go this route, but i know people want ot know the colors of the cables to splice into. For the right side of the vehicle, the colors are:
Right Rear, Negative: Blue with Yellow Line (Pin 2 on stereo)
Right Rear, Positive: Pink (Pin 11 on stereo)
Left Rear, Negative: Blue with Black Line (Pin 8 on stereo)
Left Rear, Positive: Blue with White Line (Pin 16 on stereo)

(This is the same on the Honda Fit, info from the other Amp/Sub setup)
And an example of where to splice on the right rear:
The other way is the hard or next to impossible way to do it, and that's with taking out the stereo deck, and splicing into the back side (oh so painful...) with a Hi Lo converter:
Must follow steps 1 through 14 only, anything after that is only for the Ipod adapter. This was a good link, helped me remove the actual stereo deck.
http://www.bernardiparts.com/Images/..._musiclink.pdf
Since i went the way of the Hard headed one. Follow those steps, and have the system in pieces on your shift knob (cover it in cloth, i used 2 terry cloths with rubber bands to keep it covered at all times.
What you want to play with is the large connector that looks the same as that Civic EX connector.
Peel back the electrical tape, i used a pair of wire cutters, that were blunt, and was pulling on the tape before cutting it, same way as the amp power cable. And separate all the cables, i sort of forgot to take a picture of it, so i stopped when i got my Hi Lo Converter installed to snap a shot.
Following the instructions for the Hi Lo converter, i had stripped each of the speaker cables enough to be able to wrap the ends of each of the cables a few times, and wrap it all up with electrical tape. it looks like a mess now, but keep an eye on what your doing, and don't cut toooo deep into those speaker wires, if you break it, youre screwed, cause that will shorten the bundle even more and you will have to get someone with knowhow to crimp a new cable onto the broken end.
My splices looked like this (sloppy i know, but I couldn't find a Radio shack nearby, and homefepot had really big ones, and were meant for thicker gauges.)
Then for the final run of things for the front area, i already had a set of RCA cables ready to be plugged in, and run to the trunk, they were long enough, and meant for cars, so it was durable enough. Using some zip ties, i made sure to add a loop behind the Hi Lo converter to make sure no one could pull on the cable and rip them out of their connectors, and still not cause any damage to the cable harness either. I also made sure that i had a good place for the cable to run, where it couldn't be pinched, or otherwise damaged by mechanical/moving parts.
For the trip to the back, i made sure i secured the cable to the ECU harness cable going to the Driver's gauges. and along side the power cable (please don't hurt me, this was the best trip i could find to the back of the bus.
Don't forget, run the cable to the back the same way as the power cable.
Tomorrow, i will try and get more pictures of a funky setup, i still need to remake my box for the trunk, and still be easy to remove, but for the most part, i'm sure you can find a place to connect the negative in the trunk (i connected it to the bar next to the rear lights (requires you to leave an ugly gap on your cap)
EDIT: I will continue with this tomorrow =D
I submitted here, because i couldnt stand writing up my post in the very limited space of the post screen =P
The edit screen allows larger screens to view more. (I'm still editing this, or i'm asleep, give me a break please, really long day)