Heya,
Went to change the battery in the '87 22re and I believe I broke the connection for power from the battery to the 80A main fuse. I don't recall how it looked when working but it looks like the white power cable coming from the battery is meant to connect to the square metal plate on the main fuse unit. I'm pretty much a noob so if someone could check on their car to see if this is how it works it would be appreciated. Or if this is correct, if I could get a suggestion for a name of the metal plate or a link to get a new one it would get me started again. Thanks for any info.

 

The white wire connected to that plate in the lower right corner. The white wire does carry a fair amount of current, but it's also serves as a fusible link.
You'll need to either figure out a way to reattach, or maybe get a piece of brass thae same thickness and make your own. That white wire carries a fair amount of amps, but also serves as a fusible link.
I only recommended cutting out you own only because I think that plate with the fuse wire has been discontinued. When I replaced mine I got one for a 1989, but i think that's been disc. also. Some here might have better suggestions

 

I believe the metal plate and white wire is a fusible link. This thread has a good picture showing what it should look like. I'm no expert, and someone else may jump in to correct me, but it looks like you could just add a ring connector to the white wire and attach it to the plate with one of the existing screws. Don't change the white wire. Just reattach it to the plate.

 

I poked around some posts and it looks like the white wire is suppose to attach to the plate. If I am not able to find a replacement plate I guess the route to go is just drill a hole in the bottom right of the plate (above where it originally attached), connect a ring terminal to the end of the white wire, and fasten the white wire to the metal plate the same way as the two other sets of wires. There is not that much room but probably enough for a bolt and nut.

 

That's why i thought cutting your own might work. You could copy the existing plate, except extend a tab down enough on the lower right to bolt the white wire on

Here's a great image from an older thread.
The writing in the photo isn't mine, but that fix would work also. They way Toyota designed it i imagine was to eliminate(or at least greatly reduce) voltage drop. But i'd think a good quality brass ring terminal wouldn't be much impedence.