The electrical diagram for my '96 does not seem to line up with what you are saying....so it will not be of much help.
In the '96 fuse 20 is a different value and power goes INTO it only with the ignition key in the start or run position.
Also, for the '96, fuses in the passenger compartment "IP" fuse panel, located under the dashboard on the driver's side are numbered.
The fuses in the power distribution box in the engine compartment are lettered (A, B, C)
If you can post your year and what engine you have (3.8L or 3.0L) it will help as someone with that year can look at their diagram.
1999 was a major change year, so anything newer than 1998 will be much different than my 1996 information.