Trying to shotgun electrical problems usually never ends well. Get a wiring diagram for your car. Based on that, start removing components one by one until the problem is found. I've been through this more than once and this typically has worked best for me.
This This THIS It helps you establish a map so you can isolate and work each circuit rather than get lost and chase your tail. You will be surprised at what else you may find that was goofed up by a prior owner as well.
