usually the switch,if you can get at the connector and bridge the 2 pins on the loom side if lights come on switch needs replacingHave checked fuse and bulbs other than the switch or it's connector (rtc4937 how bloody much!!!) is there anything else it could be.
So it's taken me a year to get round to fixing this glad to report switch is ok I have voltage on the loom to the switch but can't get them to come on with the connector bridged.both lights work for months then pack in for a while then start working again.any ideas where to look now?