Out of nowhere and with no warning my electrical system has stopped working and my blazer is dead.

I insert the key and try to turn it over however there is no response. There are no lights/indicators/crank/etc. I tried to jump it using my sisters van however while connected and her van running there was still no response. To make sure it was not the battery I tested the voltage and a steady output of 12v.

All power is effected, even the systems that do not require the key to be in the ignition. The rear hatch will not open when the button is pressed.

I am thinking its a short or possibly a blown fuse but any ideas or suggestions by those of you with more experience would be great!

 

are you geting power to the fuse box?

 

I had the same problem with my 99, no power to anything even with jumper cables it didn't even attempt to start. I unhooked the battery and the leads were so corroded that there was no metal contact to my battery. sanded and brushed the corrosion off and it started right up. You could also look for blown fuses, possible bad relays, bad ground or even corroded or pinched cable/wires.

 

could also possibly be the fusible link between the battery and engine. sure sounds like it.