4wd Ground

[Gryphon]

Tried the search and got nothin'.

 

I'm getting SERVICE 4WD on the DIC every time I start the truck and it won't let me shift out of 2HI. I'm heading out tomorrow to a spot where I may need my 4WD and I'd like to check the ground to see if that might be the culprit since that's an easy enough fix. Can someone please show me where it is, preferably with a pic? Thanks guys.

 

*EDIT* Sorry it's a 2005 Sierra 5.3L ECRB Z71.

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i believe its up front like right underneath the drivers seat area, sorry, i dont have any pictures