Can you explain in more depth please Kieran - so all 4 rear lamps perform rear lights and amber indicators (amber through red lens?) - brake light function too?
Yup, the four main rear lights do main rear light, braking, and indicators. I must confess I've not seen it working directly as I'm the only one driving the car. I did have a dashcam footage of it where my wife was driving my FTO behind me on our way to a show and from memory you can see all 4 come on when I brake, and I think the outer two lights (one each side) does the indicators - which oddly on the dashcam appeared red I believe, but it must be a camera oddity as I think it has amber lights. I rarely drive the Corvette at night, so I don't know how the main rear lights work. I'm assuming with main rear lights on, and brake lights coming on, that all 4 lights just become brighter. Or maybe only the two outer lights come on when the main lights are turned on and brakes make all 4 come on?
I'll have to do a video of them, AND also watch it myself (to eliminate any camera oddities) when I next take it out. Which won't be for a long while now as the garage door that the Corvette comes out of is currently blocked on that side of the driveway with a ton of wood for my loft conversion. I'll see if they work with engine off as then I can do it in the garage.
As a side note, I have no idea about my reverse lights... I'll have to check that too.