Illuminated door sill plates
Hi Everyone, I got a set of the illuminated door sill plates for my 07 coupe. I understand how to splice into the A piller however, I'm a bit confussed as to wiring the LED lights in the sills. There are four black wires that are attached to a plug. Not being color coded, I don't know which one is the ground and which ones to be used for the LED based on the color. Has anyone installed this in an 05 to 09? I was told that a 9V battery can be used to verify the colors before hard wiring and once again, if anyone has done that, I'd appreciate any tips. Thanks!