Sounds more like a wire issue itself, Have you taken a test light or volt meeter and checked to see if it has either a positive 12V or negative trigger? Did you check before the fuse or after? If after check the fuse holder.
If you swapped brains out its not likely that both of them are broke,
Check the wire coming from the parking light switch and be sure it is a live wire. Do your lights work with normal operation? if so do they work off of this wire? Unless your vehicle needs resistors to operate lights then you should be able to find your problem. If it does use resistors, check the resistance with the vehicle wiring sheet and change out resistors. They do go bad.
And as the other guys said check the jumper inside the brain. make sure it is matched to your vehicle. + or - trigger.....
Good Luck.
Chris