Ugh, what a mess.
I bought this car about a year ago, and have switched it on and off daily driver duty with my other car since then. It had a sub box and a 4-channel Kenwood amp installed in the car when I bought it. The sound was pretty good, could've been better, but still decent.
Lately though, I've been hearing more small things that just don't sound so good, so I decided to go through the car and see what all is there. I started by using the cars fader and balance to see how things sound. I found out that the right side of the car only played out of the sub box, the left side of the car seemed fine.
I went and checked the speakers individually then, and found that the right door speaker was gone, the right dash speaker and right rear speaker didn't work. The rear speakers were upgraded to 6x9 Pioneers.. the dash speakers were factory. I haven't actually looked at the door speaker in the right door, but it appears to be factory. Also, the way the Ford set this up from the factory, is the dash speakers are spliced into the door speaker wires, and then the door speaker wires run to the amp. I bought a set of Infinity 3.5s for the dash, and some 6.5 Pioneers for the doors to replace them.
Now comes the mess. The right rear speaker was hooked up properly, yet still doesn't work. The sub box has 2 tweeters, and 2 mids as well. The left side works, the right side doesn't. I popped the subwoofers off and found this mess which I've attempted to illustrate here.
For whatever reason, the positive line for the mids aren't hooked up, on either the left or right side. The wiring coming out of the box and into the amp is screwy also. The negative line is hooked into the positive hookup on the amp, and the positive from the box, goes into the negative on the amp. Again, both sides though.
Now comes the mess with the amp wiring. The amp has an A and B set of hook ups. The subwoofers are hooked up to B. The rest of the speakers are hooked into the A channel of the amp. They just doubled up the connectors and then clamped them down. Here's another awesome, highly technical wiring diagram.
I should note.. the wiring from the speakers into the amp are assumptions. I don't know for sure if they have the wires out of polarity, or if they're even hooked up in the right order. I'm just assuming they are.
So, there we have it. I have right speakers that work, but a right subwoofer that doesn't. Left speakers that don't work, and a left sub that does. I have wires coming from the sub box plugged into the amp that don't appear to be right. I also have a set of mids in a sub box that aren't hooked up for some reason. Amongst all this though, the wiring is all done very professionally looking. Go figure.
Sorry for the long post (and terrible drawings).. but thanks for the help guys.