If you have changing your car radio and don't know how to connect the speakers this guide will help. Most new radios now come ISO plugs which are the standard. each plug has spaces for 8 wires but may not always use all 8, the two 8 way plugs are sometime connected together to make one plug of 16 particularly in vauxhaul's. The small release tab on one end of these is in a different place so that you can not get the wrong 8 way plug into the wrong 8 way socket. one of these 8 way plugs is for connecting power etc. the other is for 4 speakers. the speaker wire plug is identified by the tag on the end of the plug as it will be in the middle of the short side where as the tag on the power plug is offset to one side near the corner of the plug. Which wires are are for which speakers? well the speaker wires are in pairs the 2 nearest the tab are for the rear right speaker. the next 2 are the front right, the next 2 are front left, and the last 2 at the end are the rear left. you should only connect one speaker to each pair of wires or you will either put too much load on the radio which may damage it or the speakers will be quiet, also each speaker has a positive and a negative, its not really possible for me to describe which is which in short guide like this but if you get it wrong the effect is so small that you will never be able to tell so if you not sure then dont worry about it. N.B. there are some variations to this wiring formate please always check before you connect if in doubt then get in a professional and dont blame my if you get it wrong, i have been fitting radios for a profession for over 10 years and i can not teach everything i know in one of these guides.