99 Tahoe dies immediately after starting up
 

So a during hurricane Harvey I drove home and happen to come across high waters after that I heard. Weird noise under my glove compartment about 15 min later my Tahoe cut off so I ended up replacing the computer and the fuel relay it drove great the first day the next day it cut off I let it sit a minute or two then it started but it cut right back.off a few minutes later. It starts up once but it will cut right back off and my battery happens to get drained during the process.

Shot in the dark. But alternator maybe?