No reverse lights

[Shak86]

Hi, my reverse lights aren’t working 

I’ve ruled out the bulbs and fuse these are both fine. I’ve checked the switch and it seems this is the problem. So I have replaced the switch however on installing the new switch the lights still don’t come on when the reverse gear is engaged.

I’ve take the new switch back out and tested it to make sure it’s working fine and it is.
I’ve also connected it to the car (without it being in the housing unit in the gear box) turned the ignition on and pressed the switch button in and on doing this both the reverse lights come on as they should. So I’m confused as to why they don’t do that when the switch is fitted and secured into the unit!!

Anyone else had this happen before and been able to resolve it or have any ideas on what the issue could be.

many thanks