Wiring on back of head unit

is it the original unit ? if so they fail .mine failed twice once under the 5 years cover then just outside .so i bought a better unit and replaced the speakers and added a small under seat ken wood sub .the sound quality is excellent if you have some basic DIY car electrical knowledge its a easy job to do just take ypour time many new head units come with DIN wiring so will fix on without any extra wiring you may have to add a live just take from cig lighter its easy to get to .there are you tube videos to help you ..the speaker that came with the car will need to be changed because they will sound poor with a new head unit .i used 6 and half inch hertz speakers and a 6x9 kenwood sub with an alpine head unit ..its very nice quality sound .

In fords and lincolns they are usually located behind the head unit location. It looks like a small heat sink with wires coming out of it...they are pretty far back so you will have to pull the head unit and dash kit if you changed the factory setup.

check voltage on rca outputs on the radio and on the amp and if those are fine it might be your rca cables them selves

if you are going to place the speackers into the rear shelf than you can run your wires along the underside of the shelf,then towards the back of the rear seat, then run it down the length of the seat, when you reach the bottom you will need to try to pry the backrest portion seat foward just enought to get the wire thru to the front, then you will need to get either a phillip or slotted screwdriver, open the back door and at the bottom unscrew the trim from the bottom of the door way,run wire thru do the same with the front door, then run wire behind the trim around or near where the emergency release handle is at, run wire behind instrument panel towared your deck. when you go to wiring up the deck and speakers check on the deck to see if it has a wiring diagram on it if not: most decks come as follows ( white wires front right ,blue or purple rearl left, brown front left, grey rear right red is + black is - yellow is constant +( always on so your deck is able to stay programedwith your presets and audio settings and clock)one single blue or purple wire is the remote for your ampif the colors dont match the ones on your deck then hook up your deck to the power only when the deck comes on go ahead and set your speackers to only the rear right speacker and take your wires from your speacker and touch them to the wires on the back of the deck, once you hear the audio coming thru go ahead and mark this as right rear or rr then using the same speaker change the settings to rear left speacker and do the same as with the other one mark it rl and do same for front speackers

hello melgiblett, as adding additional speakers to you current factory speakers will cause and abundance of power drain, you head unit is only designed to handle 4 speakers.. the only option would be to either splice your front or rear speakers to the new 6x9's, however you will notice a significant drop in audio volume and quality as your head unit would not be powerful enough to run all 6. with the assistance of an amplifier, you may be able to acheive all 6 speakers

your subs might be too powerful for your amp, if thats not the problem try changing your RCA cables, or try turning up the preamp output on your head unit

you could use existing speaker wire from original speakers.and or just run new wire thru plastic kick panels , thru plastic base boards theh thru plastic rear kick panel ,thru rear seat ...

forget it...

buy some speaker cable & run them from the head unit to the boot.

from the back of the stereo connect as follows:

Rear Left
green + to Big Spade on speaker
green/black - to Small Spade on speaker

Rear Right
purple + to Big Spade on speaker
purple/black - to Small Spade on speaker

I Had That Happen To Me Its A Ground Problem. Check The Negtive Speaker Terminal And The Ground Wire Runing To The HeadUnit This Should Fix It.