2010 Gen 3 Prius completely dead after battery replacement?

Came out one morning went to start car, daily driver, 180k, completely dead. Figured since battery was never replaced went to Toyota and got a new battery. Left on vacation came back 3 weeks later, installed battery, went to start car and still completely dead. No dome light, no brake lights, no head lights, no anything.

Checked battery, full charge under load. Tried to jump start (correct polarity) using my 4x4 Dodge Ram 2500 (incidentally when I am on the freeway and a Prius is trying to merge, I always let them in - and they look at me like something is not right if that big truck is letting me in - lol) and even with a jump start there is no electrical activity anywhere.

Never had a single issue, warning light etc. I am going to get my multimeter out on Monday when I am back from business and check the visible fuses.

I saw this thread for reverse polarity jump, would this 125A fuse be an issue? He had life in some electric so I would assume not.

Reverse Polarity Jump Start - Gen3 Prius wont Start | PriusChat

I would assume it might be the inverter as discussed in other threads?

Does anyone know if this is the issue if there is a test procedure for it?

I found the 2010 Repair Manual and am searching it.

Any further testing suggestions? I will report what I find.

Thanks.

 

Ok, checked all the fuses good and found out the jumper cables were bad, brand new to.

New issue: Check Hybrid System light came on.

Lights, interior lights, etc, all work on the car. Went in to the MFD Service Menu and checked the voltage status. 10.1v showing telling my probably the Traction Battery is low to. I learned that the Prius was sitting for 45 days without the rear compartment battery in it, and the service plug was not disconnected to the Traction Battery, so I believe the low charge on the Hybrid Traction Battery is the issue, I need more charge in the Traction Battery - The new battery in the rear compartment shows proper charge under load.

So I hooked up the jumpers again and let the Dodge (dual battery engine - could jumpstart a CAT D10 Tractor) truck charge the Prius for 45 mins. I then disconnected the cables, and checked the voltage and it showed 10.7v with NO Check Hybrid System warning light, so that is good and the voltage increased but super slow.

I looked up Hybrid Traction Battery charging on this site, and it seems risky. 2amp max and I have to worry about overheating and ruining cells. At the slow charge rate from the truck (I am at 2500 rpm so I know I am throwing out the amps/volts to the Prius) I would need to let my truck run almost 3 hours to get close to 12v.

Does anyone know min. voltage to start? or an easier way to charge the Hybrid Traction Battery without removing it and risking injury to it, or do I just park the truck and let it charge The Prius for 3 hours? Has anyone hooked up a battery charger to the jumper post on the Prius and charged the Hybrid Traction Battery that way?

I really appreciate all the comments. Thank you.

 

I also tried power cycling the car 3 times with no different result, and did remove the the Hybrid Traction Battery service plug and rear compartment battery to see if the reset would change anything and it did not.

 

I did check everything with my multi-meter, including reading the battery, and used a metered load check on the battery, and checking the fuses. I used the MFD voltage display because I wanted to see the load from the car taking into account everything else. The engine does not start, and I am figuring that is because the voltage is to low. Question, what is the minimum charge level on the traction battery, I see max is the 75/80% charge from other post, but what is the best way to test the traction battery load? i.e. just meter it at the service plug, or is the MFD service display taking into account the traction battery ? I assume the MFD display is giving me a cumulative reading.

 

I am the owner of the car, and a friend borrowed it who lives 4 hours away, good with cars, but accidentally left the new battery disconnected as he was called up overseas. So when he came back he realized the 12volt was not connected and this is how I got to where I am. I travel international as well, and have left the car parked before 21-30 days no issue. I can only assume the traction battery discharged because the 12v battery was not connected, but I have read elsewhere the traction battery should drain max 1-2% per day in non-use. Car has been terrific, no service issues, and runs great until this. Incidentally, the issue started when he left the dome light on and ran it dead. FYI in college I rebuilt a toyota celica engine ground up and a old bmw so I am mechanically inclined, just haven't played mechanic in 20 years.

 

I do have a ODBII for the truck, tried it and it didn't read, but didn't realize it had to be Toyota specific. Thanks.

 

I have a load tester and the 12v. is good in the rear compartment. I will buy a reader, sounds fun, and then take it to the dealer. I miss tinkering on cars. Had three Toyotas, all past 600k, and never got to tinker. Says alot about Toyota.

 

Cool bought one. Thanks for your help.