If your lights do not have connectors included strip a half inch of bare wire from the end of each power wire using your wire strippers.
How to wire roof rack lights.
Ask an expert wiring roof lights duration.
Some roof rack manufacturers may have optional light bar mounting brackets like this rola titan roof tray which makes installation as simple as spinning a few spanners.
Connect the wire from your switch to the power wires on your lights.
The cabling is run along the length of the roof attached to the roof rack or rail and in the case of a ute will generally loop across to either the sports bar or headboard of the tray itself and head down to the chassis rail then off to the engine bay.
Although not commonly adopted it is possible to loop the wire from a roof light bar.
While mounting a light bar on the bullbar is often easiest the roof mounted option is far more popular freeing up space on the bullbar for traditional driving lights.