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Touch a 9v battery to the speaker terminals for a second. If the speaker cone pops outward, note the polarity of the battery terminals. The + was on the + side of the speaker and - on the - side. If the speaker popped inward it's the opposite.
Alot of amps and speaker crossover have protection circuits built into them so when you turn up the music to much it's there so you don't blow your speakers. Try turning down the gain on the amp if that does'nt work check your speaker wiring for out of phase meaning
+ - wires are backwards. To test them use a 9v Battery touch the speaker wire to the + - terminals on the battery if the speaker pops out it's inphase and good if it pops in it is out of phase reverse wires and if all that checks out get a stonger amp.
you need a volt meter and 9v battery.
earth black contact from meter & then
with ign off probe wire to find a live , thats the memory feed goes to yellow on radio
with ign on probe wires that the constent live goes to red on radio
when lights on probe wires thats the illumination feed (if fitted to car, but not used on many new radios
then get 9v battery and with remaining wires pair and connect to battery, when speaker buzz's mark pair as they are ( ie front right rear left etc ) the speaker wires from the new radio are paired by colour ( one with black stripe with is the negative of the pair)
there should be a ground/earth which if you cant find just hook one to the body/chassis
the power feeds go to 1 block
get a test lamp and find the
switched live = goes to red
constent live = goes to yellow
ground earth = goes to black
speakers and dash display to 2nd block
speaker leads are matched in coloured pairs , use 9v battery to each pair to track speaker location, will buzz when hooked up to matched pair
Different manufacturers use different wiring. Usually the striped is positive.
An easy test is to take a battery (from a cordless drill) or a 9V, and touch the neg + pos to the correct terminal of the battery.
If the speaker pops OUT, it is wired correctly, if the speaker pops IN, reverse the wires.
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if you happen to have a speaker available, try to test the stereo. plug in a speaker and see if it works. otherwise, i don't really like this method but, it does work... unlug your factory speaker and plug a 9v battery to the speaker, if you hear a little popping/wizzing sound, the speaker works and it's the head unit.
also, check to see if the radio has an amp. sometimes the radio will be operational, but the amp isn't and that is the problem. and the easy solution is to replace the radio with an after market of choice. factory radio's that are purchased seperately are rather expensive.
The simplest way to figure out wire colors on the ford is to purchase the radio wiring harness from a stereo shop like a Metra or Scosche harness and match the aftermarket wiring color code to the opposite side (vehicle side) of the radio plug. If you are just replacing speakers, then removing the speaker from the car with the plug attached, you can easily figure out polarity. Just connect a 9v battery to the speaker leads on the speaker (NOT THE CAR) for a second will make the cone either pop out or **** in. When the cone pops out, note the polarity of the + on the 9v battery. This is the positive for the speakers. Hope this helped.
The colors are as follows. grey/tan+ LF, green/ lt.green+ RF, brown+/yellow LR, dk. blue+/blue RR. You can also verify the speakers by using a 9v battery. Hold one wire on one terminal of the 9v battery then just strike the other wire for only a second DO NOT HOLD the wires to the battery for more than an instant. You will hear a pop noise from the speaker.
Orange is memory, yellow 12v switched, black ground/earth.
***Warning!!!!!! There's 2 yellow and 2 grey wires (other grey is dimmer). If the original factory harness is still there and not cut up, all the speakers will be next to each other on the plug(s). If not, you MUST test the wire(s) with a test light (or some other way), verify the 12 switched (yellow) incase a fuse is blown. Same with the dimmer lead, you need to turn up and down the dash dimmer to get a response from that wire. If you use the wrong wires you will send 12V into the speaker leads from the radio and kill the radio!