Was driving this week end and my suburban seemed to to not throttle put emergency lights merged to center lane was only going maybe 5 to 10 mph finally pulled in to parking lot popped hood open to check thought maybe alter mayor or battery went out got jump no power barley any only two front windows had power not rear and changed out battery still no power cluster valet lights up alternator hood checked ground cables power nothing loose can’t figure out why truck barley has power can’t crank no lights

 

Welcome from Florida. Check yiur battery cables at both ends for corrosion and make sure they are tight. Also check all the grounds to the frame and body of the truck.