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Discussion Starter · #1 ·
:confused:

bonjour peepz,

ive been reading posts off you lot for a while now (so thanks for all the advice) and never really had anything else to ask- til now!

ive upgraded my speakers but cant for the life of me work out the polarity of the wires, as each speaker has different coloured wires for it, each with no +/- identifying markings on them, just a couple of numbers. nor does it say anything on the old speakers or old speaker connections.
so im pretty stumped. ive emailed a few peugeot dealerships with this query, with the best answer being 'weve checked our wiring diagrams, but cant work it out, you're best off contactin an auto-leccy', which was helpful of them.

so im really hoping you lot can come to thy rescuage.

if you can- ta very muchly :D
 

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hi mate i have just installed an amp and some parcel shelf speakers and found a doc that tells you the polarity for most cars (as they are the same) soon as i find it i will pass it on here.

but in the mean time done you have a volt meter that will help you. such as if you get it right it should be +volts and wrong -volts, just a suggestion.

will have a look for the doc and pass it on
 

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cck2k9 said:
hi mate i have just installed an amp and some parcel shelf speakers and found a doc that tells you the polarity for most cars (as they are the same) soon as i find it i will pass it on here.

but in the mean time done you have a volt meter that will help you. such as if you get it right it should be +volts and wrong -volts, just a suggestion.

will have a look for the doc and pass it on
found what i was looking for and it is here:http://pdf.crse.com/manuals/3278366111.pdf

its a wiring diagram for sony hu but on the right it tells you what wire for what speaker.

it quotes under it "negative polarity positions 2,4,6 and 8 have striped leads"

hope this helps:thumb:
 

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Discussion Starter · #6 ·
cheers for that chaps, much appreciated.
i got the head unit out and used the wiring diagram i got with it to identify the speaker wires coming out of the connector, BUT, they are totally different colours to the wires at the speaker end! i now know which wires are for which speaker from the head unit end, but cant tell the polarity as the wires change somewhere throughout the car.

so im thinking what 2k9 suggested with the multimeter, will this work easily enough? as i havent much experience with the old multimeter :)

thanks
 

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Discussion Starter · #8 ·
well ive borrowed my moms fella's multimeter but i havent got a clue how to use it. which setting do i need to have it on? and do i connect each probe to each wire, or do i have to connect one to the chassis?
 

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well generally (thinking back to trade training here) there are several holes for the probes. plug them into something that looks like V~ turn the dial or w/e to the corresponding selection. hook the probes to the one wire set (dont matter which way) turn your sound on and you should get either a + or - if it is + you got the polarity right such as red and black if - you swap them around and viola.

thats how i would do it, not sure if that correct but that how it works on computer and other circuit devices
 

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~V = alternating current; this will not give you a reading.

A line with a dotted line above it is DC, which you need. If the meter has settings for various voltage, turn it to the one that is just above 12V. (Usually 20)

Connect the red lead to the wire you are testing and the black lead to an earth. If you are in the car, any reasonable sized metal part of the car body will do.

  • If there is no reading - i.e. zero, then you have connected an earth to an earth.
  • If you get a positive reading, you have connected a positive to an earth;
  • if you get a negative voltage, you have connected a negative to earth
 

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Just tried the above suggestion and it doesn't work. Both pins produce a bit over 5 positive volts. If I switch the DMD leads around so that red is on the car earth and black is on either of the two wire terminals from the stereo then I get 5 negative volts from both pins. Back to the drawing board.
 

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If you have identified the wires at one end wouldn't it be easier to just do a resistance (Ohm) measurement to see which wire goes where?

Most multimeters will have a buzzer setting to check for connection, just use that and put one measuring pin on a speaker connection behind the head unit and then use the other measuring pin on the cable ends in the door and when you get a signal you have found which ones are connected.

This is assuming that there is no filtering involved before the speakers, i don't think there is but i'm not 100% sure, if there is it is probably for the tweeters in the dashboard.
 

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Thanks for the suggestion but I have managed to get it sorted. The wiring harness in the car (RCZ) is original factory install, also included is an amplifier so the speaker wires in question are routed via the amp. The plugs on the end of the wires that plug directly into the speakers are only marked with a 1 or 2 and the speakers have no markings at all. After speaking to a couple of audio specialists I discovered that it doesn't really matter which wire is plugged into either terminal on the speaker so long as all speakers are connected in the same way. That is if I connect pin one to the positive terminal on one speaker than you must do the same for all speakers. Apparently a standard speaker, one without any capacitors, is not polarity dependent however all speakers must be connected the same. But another interesting fact I learnt was that if you connect a small battery across the terminals of your speaker it will make the speaker either push out or pull in and if it pushes out then the terminal that is connected to the positive end of the battery is also the positive terminal for the speaker. Armed with this info I was able to determine which wire on the keyed plug, that connects to the speaker, was positive. So job done and my Focal speakers sound great. Thanks

PS Sorry for hijacking a question about the 307 but thought it relevant. Also just to advise for the RCZ pin one on the speaker terminals is in fact the positive terminal... On my car!
 

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Speakers aren't polarised. The only reason for speakers having + / - markings is from way back in the early days of car radio when the audio amp had one lead with the audio signal going to the speaker with the other end of the speaker going to ground. When cars where positive earth the + side would go to ground with the - side going to the amplifier output. These days with higher output units, neither side goes to ground. The audio amplifier uses a bridged output with one of the outputs varying between 0v to a positive value which could well be higher than 12v and the other being the same range from 0v to an equal negative value. The only reason to wire them up the same way i.e. all the terminal marked 1 to the same side of the speakers is to ensure they are all in phase - the cones in each speaker move the same way either in or out given the same input. If they aren't in phase then the sound will be lacking in depth.
 
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