2002 Avalanche 1500 5.3L with the "Z" package

Today went to start it and it will only run a few seconds.
Headlights won't turn on. No power to headlight relay.
No dome light.
No light under hood.
Jumpered battery--same conditions.
Fuses look Ok under hood and inside.
Terminals tight.

First, What would keep the headlights off? http://www.automotiveforums.com/vbulletin/images/smilies/banghead.gif
With so many different problems, the only common thing I can think of would be a bad ground. Anyone have any ideas? :confused:

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

//2000CAYukon

Dealer found the problem, loose wire in the security system shorted out a fuse in the security system. This is somewhere under the steering column.

2002 Avalanche 1500 5.3L with the "Z" package

Today went to start it and it will only run a few seconds.
Headlights won't turn on. No power to headlight relay.
No dome light.
No light under hood.
Jumpered battery--same conditions.
Fuses look Ok under hood and inside.
Terminals tight.

First, What would keep the headlights off? http://www.automotiveforums.com/vbulletin/images/smilies/banghead.gif
With so many different problems, the only common thing I can think of would be a bad ground. Anyone have any ideas? :confused:
I have a 2004 avalanche with electrical problem, melted in my driveway today anyone else?