hello

The radio connector outputs positive to all  speakers wires. 
I checked with a multimeter and all the wires are fine.

It seems to be a problem with 6000cd.

what do you think?

What do you recommend I check?

thx

mondeo 2013

18 hours ago, ok99 said:

 

This is the connector that connects to the radio. There is no ground in the speakers

I'm not sure of the problem you have. Speakers do not have a positive and a negative in the normal sense of a 12 volt supply. I can see from your photo that your system has a 4 speaker output. Each twisted pair is one channel. You can't use a multimeter on DC volts to measure the output to the speakers.

The problem if you have no sound is likely to be the actual 6000CD unit.

4 hours ago, unofix said:

I'm not sure of the problem you have. Speakers do not have a positive and a negative in the normal sense of a 12 volt supply. I can see from your photo that your system has a 4 speaker output. Each twisted pair is one channel. You can't use a multimeter on DC volts to measure the output to the speakers.

The problem if you have no sound is likely to be the actual 6000CD unit.

I connected the 4 speakers but the volume is low. Even if I put the wires upside down in one of the speakers, the volume does not change

48 minutes ago, ok99 said:

I connected the 4 speakers but the volume is low. Even if I put the wires upside down in one of the speakers, the volume does not change

The good news with such an old unit, is they are as cheap as anything on Ebay. My own was replaced at a cost of £20, yours is a bit newer, probably £25+. Even as a diagnostic tool, it may be worth ponying up for one as a spare! Make sure it comes with the PIN...

3 hours ago, StephenFord said:

The good news with such an old unit, is they are as cheap as anything on Ebay. My own was replaced at a cost of £20, yours is a bit newer, probably £25+. Even as a diagnostic tool, it may be worth ponying up for one as a spare! Make sure it comes with the PIN...

 

Is there a way to check the unit? 

What voltage should I get from each channel?

1 hour ago, ok99 said:

What voltage should I get from each channel?

As I said earlier you can not measure the voltage to the speakers with a multimeter. It is an alternating signal of only a few millivolts. If you want to check the audio output signal then you will need an oscilloscope and a x10 high impedance scope probe.

1 minute ago, unofix said:

... you will need an oscilloscope and a x10 high impedance scope probe.

Oh, I remember using one of those in my physics class at school! Great bit of kit!

9 minutes ago, StephenFord said:

Oh, I remember using one of those in my physics class at school! Great bit of kit!

I imagine back then it was the size of a suitcase and had only one or if you were lucky two channels on a green CRT screen. Now they are only the size of a small loaf (brown or white 🤣) and usually have 4 or more channels on a full colour LCD display. I worked for a while in a calibration lab while I was an apprentice and learnt how to repair and calibrate the old models. Happy days !!!