Started this forever ago (almost a year) but luckily I left myself enough love notes to relatively pick up and keep going without double checking everything from the beginning.
Since I'm a dinosaur writing out the pinouts of each connector used and adding it's destination/description allows me to minimize scrolling or clicking between between pages, as well as kinda sticks in my brain better. It also allows me to make a quick delete list which is usually where I start with these projects. I'll prune/remove unnecessary circuits after unwrapping, then begin actual work of merging, adding, and rerouting.
I've been to this rodeo a few times and have new terminals and wire seals for most standard Toyota stuff. Ih8soldering old, s***ty, wires. These are Sumitomo TS series .187 sealed terminals which carry heavy loads and fit in connectors such as your starter, ABS wiring, and in this instance, the EB1 connector in the FZJ that supplies the +B circuit via the Main Relay
Since the EB1 connector uses only one out of three spots in the connector, I went ahead and rerouted the ignition 12v supply from the EA2 connector behind the fuse box that gets power from IG2 circuit at the ignition switch to it, as well as began adding the 15a ETCS fuse that powers the electronic portion of the throttle the ECU needs. The connector on this truck is broken, but I hoard hard. SC400 uses same connector which is what this black replacement is from
IG2 circuit also powers the injectors as well. The Sequoia pairs the coils, injectors, and noise filters together but splits the banks to be separate, whereas the 80 series powers injectors via IL1 and ignition via EB1 even though the parent power source is the same. I split the load with EB1 (near fuse box) carrying the LH bank and IL1(near ECU under dash) carrying the RH bank. This was all run through the harness on the LH bank and will terminate in its original spot.
Since the starter circuit is completely different between the two and the NSS doesn't carry the starter load, I used the Sequoia 18awg wiring and method to trigger an auxiliary relay (not yet added) for the starter whose wiring is ran along the block to the back of the engine in a sub-harness from the factory.