One circuit of the backbox lighting on my recently acquired Whirlwind is out. After some troubleshooting, I have it isolated to the little circuitboard on the back side of the translight portion of the backbox (the part that swings out). Further, I found I can get the lights to come on if I jump the circuit from the relay. My immediate thought is that the relay must be bad...but I've been fooled far too often my jumping to such conclusions. I'm having trouble locating this little circuit in the schematic so I thought I would ask the experts if there is something else I need to check that should be triggering this relay (which would seem odd given the other circuits light up), or if there is some definitive test to pinpoint the issue t the relay or something else I should try.