I'm in the process of installing both fog and driving lights (PIAA 540s) on my 2010 JCW convertible. I have thus far successfully connected the fogs to work with the OEM fog light switch, but I'm having trouble with the driving lights.
The issue is that I have not been able to locate a 12V source that activates with the high beams. Please help!

 

When I installed my Hellas I just tapped into the wire that actually connects to the high beam at the headlight itself. That voltage is used to trigger the relay that turns on the driving lights. Primary voltage for the lights can be accessed by tapping into the main voltage input at the underhood fuse box. A good chassis ground is located underneath the fuse box. Good luck.

 

Thanks a lot. I tapped the red/yellow cable going into the left headlight and triggered the switch off of that. I did the same with the fogs, and I now have everything as it should be.