First step to help you narrow down is determine what exactly (if anything) does and does not work. I know what I think about part of what you said, but the oil light confuses---because it "should not work" either
In any case I would start with the bulkhead connector itself and I THINK there is more than one fuse link in that car.
You were talking about the red wire. If there is NO power at the interior of the car, that is for sure a problem right in the connector itself. IF you look at the connector, you can see latches where the sections come apart
One problem you have is that because it's a later model, there are no free service manuals available. Go to MyMopar and there is a somewhat wiring diagram, but these leave out some details (of connectors and options) and may not show "everything"
I may have a poor quality copy of the wiring. You need to look around the www and find a CD/DVD or paper reprint of the shop manual
