Will not crank or start

Okay,

Does nothing at all?

See my link (my answers):

https://www.2carpros.com/questions/1996-chevrolet-tahoe-wont-start-sounds-dead-battery-jumpbox-get-same-reults

I posted that before this other things came into being.

Many times, my link (the "get in there" motivational parts ) will be your fix.

There are other "modern car" over engineered possibilities too.

I grabbed this: "Repair guides" from the top right side of our site pages.

https://www.2carpros.com/articles

Lets scan through the list, "electrical" to "security", something may aid you in there too (even for future repairs).

I am banking on my first link answers.

Let us know how it goes

The Medic

In ancient times, this was called the solenoid or starter solenoid. (nowadays it is often called a "starter relay")

https://shop.advanceautoparts.com/web/PartSearchCmd?storeId=10151&catalogId=10051&langId=-1&pageId=partTypeList&actionSrc=Form&searchTerm=starter%20solenoid&vehicleIdSearch=8340

You have a 5.0 Liter? (Not a 4.6)

Do you have a voltmeter or 12 volt test light?

We might be able to narrow down where the issue might be.

The Medic

Have you tried this?

See my picture.

The Medic