V40 T4 CD fog lights problems

Hello All. my 1997 V40 T4 CD recently failed its MOT and one of the culprits was that the rear fog lights were not working. Initially it was thought the fog light switch wasn't working. After going through hard time, i finally got one from a scrap yard yesterday but after fixing it, the fog lights ( front & Rear) won't work. I've had to declare the car Off road as a result of the road tax also running out. I will extremely pleased if any help can be offered on this situation i find my self in please. Thank you

I hope you checked your fuses and bulbs before buying the switch?

are you sure that you have the light switch turned to the right setting,not the off position,its hard to tell with the drl`s coming on anyway.remember the fog lights wont work unless the main light switch is turned on sometimes turning the light switch blows the fuses also if i was you ,assuming you want a quick fix for the mot,is to run a piece of wire from the live battery terminal,put a 10 amp red fuse onto the wire (you can get these from halfords),then attach a switch to it somewhere ,run the wire through to the fog light(which will already go to earth)should take about an hour maybe and 5 pounds(?).i accept that this is a temporarary fix but will get you the mot