your rear(cargo) light is stuck on always? I suspect that one or both of your door bumpers are deteriorated enough so that the car thinks the doors are open even when they are actually shut. That or your rear hatch sensor doesn't think the hatch is shut.
Have the same problem. Have somebody check if the backup and license plate lights work. I haven't had time to run the wiring check as I've been moving and no time, but neither of these work on my 88t. It is a good place to start.