When I bought my H3 (used) it already had the roof market lights fitted. They are on all the time.

There are times when it would be nice to turn these off - the car is distinctive enough in the UK without being lit up like a christmas tree.

I've not any experience of automotive electrics, but I'm assuming I need to

1) locate the power wires to the roof lights, and add a relay in (would I do this on the + or - wire?)
2) run a low power circuit to the relay and put another switch on the dash

I've already got the extra lights fitted in the lower grill (again, these were factory fitted when I bought the car) and that has a push button next to the lighter sockets in the dash, so I assume I'd replicate this, but with my new circuit switching the relay I've installed at 1 above

Anyone done this? Any pointers you can give a newbie to locating the relevant wires?

Cheers!

 

All vehicles have different colored wiring, for different circuits.






Never the same "solid" color for a different circuit, yet they may use the same color with a "tracer":




Find the + wire, and install a switch before it gets to the lights.

Simple as that. GL