I need a bit of help on troubleshooting this issue. 2004 honda element

Car drove completely fine before this. i left the house, drove a few blocks to the store. came out and had zero power. I had someone jump me, i drove about 4 blocks and it dies while driving again, i just so happen to be right at an auto zone, coast in. they test my battery (GOOD), jump me and i leave. it dies again as I pull into my driveway.

I test the battery myself, tests at 12v. I jumped the car. belts are turning and battery stays around 14.5v, so the alternator is working. I've checked all fuses under the hood, and under the dash and they're all getting power. If i leave the car idling it stays on. If i turn the car off and try to start it, there is zero power to anything.

 

RESOLVED.

 

What happened to be the problem.?

 

the ground was all corroded inside the casing. bolted a new one on and presto. power.

 

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