I have a 1996 yukon slt 4x4 for a few months now. Yesterday morning the truck wouldn't start without being jumped, just clicked when the ignition switch. It then ran all day yesterday and today without any problems. The tonight after sitting for 1hour, it wouldn't start without being jumped. Amp guage it showing 14v we running, and battery is putting out 12.8v. Anyone have any suggestions on what it might be?

I would start with cleaning all of the battery connections including where they connect at the block and starter.

Also check the resistance in each cable and replace any that are bad.

//2000CAYukon