06 prius: No warning lights, accessories turn on but won't start

Hello fellow second gen owners! Help needed and appreciated!
Long story short she (my prius) was sitting for quite a bit due to her overheating issue (blown head gasket) and not finding an inexpensive mechanic. Finally found one and got her engine swapped but I haven't gotten her to start. I charged her hybrid batteries and got a new 12 volt. The image with the warning lights on the screen was taken a couple days ago and the one with none was tonight. (I've always had all the yellow indications on, she comes with some baggage) Turns out the black terminal that goes on top of the 12v battery was missing the fuse. Now I get no warning lights, no codes (none before either), no ready sign and no speed indication number. For those who might wonder, yes the orange plug on the hybrid battery is in all the way. When I turned her on after inserting the missing fuse her battery showed multiple blue bars, but now just the purple. If I hold my foot on the brake and keep pushing the start button I get cold cranks (hybrid battery clicks) but nothing that starts her up. I will be looking at fuses and taking apart the inverter converter this weekend to see if they put it back together wrong, other than that I am at a loss. If anyone knows anything I would highly appreciate it! I have scoured the internet and have found nothing.

 

Hello, I am using the Innova 3100i. I know it isn't specifically a prius scanner but it has always told me what I needed to know, yet even with all the yellow indications I get nothing. I charge the batteries with a small 12v battery charger, the batteries were at like 5 and some change and I charged them to high 7's some at 8. I would assume that if they weren't high enough she would give me something like she has in the past.

 

We've got 12.16V coming through.

 

When I test the 12v directly it gives me 12.62V. When I put her in self diagnostic mode she shows me 11.8V. I have even tried jumping her and she won't turn over, still no codes, or warning lights on the screen. When I jumped it the self diagnostic mode showed 14.1V. I have seen something online that said the engine ground wire may not be connected properly. But surprisingly I can't find anything on where it's actually supposed to go. But after the mechanics were done and I had a chance to check the job I did have a suspicion since it looked wrong.

 

It sure feels that way!

 

I will be checking all grounds soon, hoping that is the cause!

 

Hello, all are without corrosion, all the wires click in good, all screws are tight, all clamps are secure and placed properly. All accessories turn on, all lights are bright (as bright as they can be given this is an 06 and none of the bulbs has ever been replaced). There is also no corrosion on the hybrid battery (orange plug, bus bars, nuts, batteries, any wiring near the orange plug) all is free and clear. I have never really scoped out the bars underneath the battery but I'm unsure if that would even do anything.