2011 Prius not charging 12V system

Well, the easier question would be "where are the only two fuses that don't control the 12V side?" You don't have to think about those two (one's in the battery service plug and one's inside the inverter). All the other accessible fuses in the car are on the 12V side, and getting to IG ON depends on several different circuits. The wiring diagram, and the repair manual for troubleshooting steps, can be found as described here:

Toyota Service Information and Where To Find It | PriusChat

The 125 amp DC/DC fuse buried inside the front fuse box is a nightmare to get access to. There are some accessible points where it can be easily tested with a meter though:



That photo is from this post, which has more details.

 

Perhaps they should check the fuseable link?

 

I'm pretty sure if they follow the post linked in #21, they will.

 

First, more input from you. When you press the Power button twice does the dash light up?

Do you still have the normal Prius 12v battery in addition to the one you added next to your 12-120v inverter?

What power related things work? Lights? Horn? Radio? Be specific.

How proficient are you with electrical troubleshooting? Do you have a voltmeter and know how to check voltages? Can you read a simple power diagram and trace voltages?

Do you have the funds to buy parts or tools to fix this car? Lets say you need a $200 battery and a $300 engine fuse box. Or a $500 used inverter? Or a $500 water pump?

Do you have experience that is relatable to changing a water pump or inverter?

Does this drawing make sense to you?

 

That test point proves nothing if you don't first check power upstream of the 125a like the fuse box jump point. See diagram. The attachment in my post above shows you how to visually inspect the 125a.

 

The white cable may not have been plugged in properly. It comes from the battery. If so the power jump point would have been dead at the time. It is the advantage of understanding a diagram.

So now its back to making a cheap grid tied inverter work without the grid?

 

By the way, your 12v measurement in Ready should be 13.5 to 14.9 vdc and not less than 13v. Without the higher voltage the system is not charging.

It could be the powerpath was there all along but the 12v battery was too low to Ready the car. That's why I was asking about things like lights and radio. If you somehow charged the +12 battery or it floated up in voltage the car may have then had enough voltage to Ready.

Without a charging voltage the car won't run for long.

 

It's probably overheated. You'll have to clean it very well and make it shinny....
And also where it connects in the fuse box....