How do I know what is keeping my magnum from starting? on 2005 Dodge Magnum

My magnum has 1/2 a tank of gas in it. I just had the battery tested and it is fully charged. When I turn the key to the on position there is nothing. No gauges, radio, lights, or annoying door ding. The people I spoke with at autozone said it was most likely a connectiion somewhere.

Asked by for the 2005 Dodge Magnum
1 answer
I had this problem maybe two or three years ago. When you put the key in to start the it will start but shuts back off. I found that its the sercurity system on the car. Make sure the key is snapped together and sercured.