2005 GMC Envoy Denali had a parasitic battery drain. Troubleshot to the seats circuit breaker (#8) in the rear fuse box. Pull the breaker, no more dead battery. I need a wiring diagram for the seats.

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Question moved to model category.

Here are all your fuses

GMC Envoy (2002-2009) fuses and relays

https://fuse-box.info > gmc > gmc-envoy-2002-2009-f...

Here you will find fuse box diagrams of GMC Envoy 2002, 2003, 2004, 2005, 2006, 2007, 2008 and 2009, get information about the location of the fuse panels ...

Check in the under hood fuse block or power distribution center for fuse #72 and #75 these are 60 amp fuses. If the problem isn't there you have Two separate problems, check at the switches for battery voltage and ground. The most common problem is switches.

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Rear under seat fuse box.
A fuse for ddm/ driver door module. A circuit breaker for power window. Use a test lite and check voltage at fuse and circuit breaker for power window. For the system, you need voltage and ground.

Rear fuse box , under left back seat ! SEATS circuit breaker B 30amp .
https://www.youtube.com/watch?v=Fhd2DPbTjeE&t=86s

The T PARK fuse in the rear fuse-relay block supplies battery positive voltage to a separate park lamp circuit connected to the trailer wiring harness..
For trailer wiring, separate turn signal circuits are connected through the GMSF to the trailer wiring harness.
Fuse Block - Rear
Beneath the left rear seat
Trailer TR/PARK fuse 42 10amp

pull fuses or relay until current drop to 50mA and less.

If other functions such as window controls and power seat controls are normal, here are some possibilities;
1) Circuit Breaker #8 in rear fuse panel
2) Defective Driver Memory Seat Module (under driver's seat)
3) Break in data lines between Driver's Memory Seat Module and Drivers Door Module
4) Fuse 23 & 6 in rear fuse panel

Circuit breaker #8 is located in the rear fuse panel under the rear seat, there is also fuse #19 for the controls.

Rear fuse box is under the seat bottom, rear seat (middle row) on the driver's side. There is a plastic cover over the top of it that snaps into place.