Thanks. I'll have to look into that deeper as I thought I checked that already. Having issues tracking the wires down from the radar arch. Also been looking for a wiring diagram.
I'm wondering the same. I recently purchased a 90 310EC. I'm not sure where the switch is for the two radar arch, downward facing, lights. The indirect light switch appears to turn on the two step lights going down into the cabin and two lights (one on each side) on the under side of the port...