2002 Denali will not start. While driving the battery light came on stayed on for a while then went off. No issues while driving I got home parked the vehicle and when I came out to drive again the vehicle had no power at all. I tried jumping the battery to start but still nothing would not crank or anything...total electrical outage...any suggestions what could be the issue.... This is a fairly new battery that is in the truck

Your key switch may be bad or a loss wire grounding out

Remove the battery I think it is open inside and the post is dead.

I have a 1999 Sienna toyota but my flickering light when car on..

sounds alot like a bad battery

The lights will stay on with or without the keys on most cars if the switch itself isn't turned off, also make sure all the doors are closed tight, and the sensors on the doors are working correctly.

check the relays for both lights and indicators

I had problems with my remote button, with battery fully charged turn on key for ten second, turn key off un-hook positve side of battery, re conect turn key to on postion then try to start, it worked for me I have a 2003 denali yukon XL, the motor would fire then stop.

Several GM products, including the Chevrolet Impala and Malibu, the Oldsmobile Alero, the Pontiac Grand Prix, and Saturn Ion, have issues with the Security light coming on. This is many times an indication of a failing Body Control Module (BCM). Initially, the Security light will come on then go off, progressing to a constant on light, before the car will refuse to start. Other symptoms may include erratic action of electronics, a clicking sound coming from the glove box, and the air conditioning failing to blow cold air. I recommend a shop that specializes in the electronic systems of vehicles to diagnosis and make the necessary repairs. They should keep the car until they replicate the symptoms described. A new BCM from GM should cost about $230; plan on another $200 for them to diagnose the problem, replace the unit, and program the new unit. The dealers quote between $700 and $1,100 for the same repair. My experience and the experiences I have read on the internet, indicate the new BCM should last only about a year.

check for loose battery connection. or maybe a cable going bad. they can corrode inside and the copper wire will turn green

You likely have it repaired by now but it sounds like a classic case of oxidized battery or cable connection (sometimes mis-diagnosed as bad battery but cured with new (clean) battery)