Lightbar installation using fusebox?

If you look in the wiring diagram for the "inner circuit" drawings of the fuse box in question, you can see which empty slots are fed from what, and which ones have terminals coming out of the box and which terminals those are.

Toyota Service Information and Where To Find It | PriusChat

 

Would the pdf in post 2 help?
Looking for 2023 Prius Prime Fuse Box Diagram | PriusChat

I don't see much that could be use to add a circuit but keep the thread posted please, I am also interested in this!

Not OP but I wanted to say thanks for the link as I discovered my library had a free Chilton access and it has some interesting stuff for the Gen 5. I can't seem to find anything for the fuse box or distribution box with empty slots. Any idea of alternative names? I'm also interested in this project.

The PDF from the other thread seems a bit more comprehensive but it might not be taken from the same source

 

Make sure you're looking in the Electrical Wiring Diagram. That's the EWD tab if you're signed in to TIS; I don't know if things look different the way Chilton arranges it.

The wiring diagrams have sections on Location and Routing, and also Relay Locations. Relay Locations sections also show the fuses (they're in the same boxes, after all) and will have "Inner Circuit" pages that show what all the interconnections are inside the boxes, and the connector and pin numbers where the circuits come out.

 

i got curious after reading this thread. is the light bar mentioned similar to this?

 

I am not sure why this guy disconnected his stock third brake light to add this instead of just using both but hey. My understanding on priusdriver223 was for the front as that's where the fuse box is. In the back it'd be easier to add it to the battery next to the mini fuse box for the charger. I might be wrong. I do think the car could use some more light for night driving though so front would make sense.




Any updates priusdriver223?

I think what I have access to for diagrams is nowhere close to TIS so I haven't found much. Looking at the manual there might be some heated rear seat fuse that should be empty on my trim but not sure if that's of any use.

I did find this guy's video and thread who added fog lights to his Rav4 Hybrid which should be somewhat similar:
https://www.reddit.com/link/11hjsz4/video/51hih5xxz5ib1/player


There's also this video where the guy has a pretty clean install except that it's straight to the battery:

 

That sucks man, I hope it gets fixed well and quickly!

 

I too will be installing a setup for a lightbar once I get things squared away with my trailer light situation.

I did a clean setup in my 22 RAV4 using an additional fuse block that I installed. All main power for light was ran direct from battery and with the Gen5's there is enough plastic body panels under them to run a nice heavy gauge wire from battery to engine compartment to an accessory light bar.

With my trailer light setup, I'd use the parking lights as the trigger wire for additional/supplemental lighting. Can't post photos here but I have the wire isolated at the rear of the vehicle on the harness. I tend to relay everything to protect my vehicles wiring harness.

 

Have you ever gotten around to trying this?

 

^^^ Your positive wire connection to the jump point doesn't sound secure and safe at all.

You risk arcing and sparking, which result in a lot of heat, and therefore risk of fire, or at the very least, melting components under your hood.

SM-G781V ?

 

Does your fusebox have any open terminals? In the Gen 3 Prius fusebox, there are two 1/4 inch open terminals that are always hot (+12VDC), so it is like connecting to the 12V battery positive terminal.

In this picture, there are two red wires connected to the terminals.

SM-G781V ?

 

Well, I was looking for somewhere to wire the positive wire for a pigtail adapter for an SAE connector to connect a battery charger/maintainer on the Crown Signia we just got.

There are no open 1/4 inch blade terminals like the Gen 3 Prius fusebox had. But there are several open fuse locations to insert a fuse tap into.



SM-G781V ?

 

I believe that all of the fuses on each side are supplied by a copper bus bar running down one side of the line of fuses. The fuses range from 7.5 amp to 30 amps, so you should be good up to 30 amps?

When you test the open fuse "slots", you will see that only one side of the slot has a copper conductor, the other side is blank. You will have to install the fuse tap accordingly, put the side away from the side with the wire coming out of the fuse tap into the one with the conductor in it.

SM-G781V ?