Wiring aux. light to cargo lamp switch
I want to add some auxiliary lights to the rear of my 02 1500HD and switch them on and off with the cargo lamp switch. I figured the easiest way to accomplish this would be to go straight to the hot wire off of the switch in the dash. I pulled the switch and there are 5 wires going into the switch, one of which is black so I'll assume that's the ground.
With the switch (and the cargo lamp) on, none of the wires are hot. When I push the switch off, one of the wires (dk. blue) is hot. An orange wire is hot when the headlights and fog lamps are on (the fog lamp is controlled by a different button within the same switch assembly). I couldn't find any combination of cargo/fog lights on/off or key on/off that made either of the two remaining wires (purple, gray) hot.
I pulled the light assembly itself and the wires going to the two cargo lamp bulbs is lt. green w/ orange stripe, but it's not practical to tie in there because the harness to that assembly goes straight forward across the middle of the cab above the headliner. I have found the dark blue wire behind the driver's side A-pillar cover and it goes off when the lamp comes on, just like the switch.
What would be the best way to wire my new lights into this circuit?