How do you attach a power drivers side mirror on a 1996 GMC Jimmy? Existing mirror was knocked from mooring. Wiring still attached and intact. Mirror controls still work. Plastic connectors are broken. Can see how wiring is connected but can't see how I would fasten a new mirrior to the car if I bought one.

SOURCE: HAVE A 03 GMC SIERRA

I had the same problem in my wife's 2003 Yukon Denali. The power seats and passengers side window wouldn't work. Turned out to be a blown Buss Type fuse in the Underhood Fuse Block. It is the one marked MBEC 1 50amp. Hard to tell if the are blown so look very carefully. Should look like a hoop with two shiny solderlooking bubbles on either side. On my blown fuse, it caught my attention because it looked like the solder was missing and I had to look very closely to see the bottom of the "hoop" was open. They are very hard to remove and must be pulled straight up.
This type of fuse looks like a red square with a clear plastic top showing the fuse link under the plastic. On my vehicle it is on the top row second one from the left.

SOURCE: need to replace passenger side view mirror 200 GMC Jimmy Diamond

On my '97, there was a triangular shaped piece of plastic on the inside trim that had to be removed. I think all three mounting screws were under that. It's been a few years, but I think that was how it was done.
I remember it was pretty easy though.

SOURCE: How do you remove the door panel on a 1997 GMC 1/2 ton trucks?

http://www.autozone.com/shopping/repairGuide.htm?pageId=0900c1528008f768
Hope this helps!

SOURCE: how do i remove the drivers side door panel? need to access wiring to replace the drivers side mirror.

how do i replace the side mirror on 94 acura integra

SOURCE: Trying to re-mount the rear view mirror on a 97 Gmc Jimmy.

Try looking underneath the arm that runs from the mounting bracket to the mirror itself. You would be looking for a small allen or torx slotted screw. It will probably be metric if its an allen screw. I don't have anything that new so there is a possibility that it is covered with a piece of plastic molding which you should be able to pop off with a little patience and fiddling. Hope this helps.