No lights or power anywhere unless we jump start it.

Anyone know how the electricity from the 12v in the back gets to the front?

We have 2 2008 Prius, and Blue went dark recently. We suppose either a dome light was left on or a key fob left in the ignition killed the 12 v battery. Auto repair store jumped it with a battery jumper.
But when we got home, after turning off, a hundred percent darkness, not even interior lights.

We bought a AGM capable 4 amp charger and attempted a recharge but no success.

We jumped it from Silver Surfer and drove it about a couple miles and things went well, but the VSC and Red Triangle lights came on along with a (0) light.

MFD showed hybrid battery charge increased to 4 bars as we descended for about 3/4 of a mile.

We bought a new 12v battery today from the Toyota dealer but no change. Still 100% dark, no interior lights or dashboard lights.
We replaced the AM10 fuse today but still no change. (The fusebox is kind of corroded).

We don't have a multimeter and Blue is my kids car and they are freaking the F out. She had just paid for an oil change and new front brake pads at 140,000 miles. Our availably money for car care is way past low.

I'm thinking if it can jump twice then the problem is the 12v isn't getting electricity from the 12v in the rear to the front of the car. And the dc-dc converter powered the dash, radio, lights as we drove around the neighborhood.

Any recommendations on why juice may have stopped travelling from the trunk to under the hood?

I'm figuring Toyota didn't give us a dead battery.

 

The auto repair place that had replaced the front brake pads told my daughter it was a wire they needed to replace. It may have been a wire going from the rear to the fuse box in the front, but i'm not a 100% certain about that.

Thank you all for your responses!