Spliced into the cobra wiring (cobra side of factory plug) Frank, so that the car wiring is not altered. Somebody suggested a two pole switch - meaning both wires are switched. I don't consider a switch is necessary, but fitting one would then mean that only one lamp was switched in - either cobra or high level light. I suspect that what's going on here is that while you car is under warranty they don't approve of DIY mods. Ask the mechanic if he'd approve of a two pole changeover switch.
The live side of my additional lamp is the red wire, but some are not colour coded. I marked the live just to be sure - wet dark night etc etc.........
