This may also be true for B2000, If someone could confirm that would be great!
Starter trigger(key onto start) is black/yellow on the 6+4 pin multi connector near the battery coming from the main loom.
Power is given to the inside fuse box and key switch from a 2 pin multi connector with red/white & red wires. This pushes into the bottom of the OEM fuse box by the battery.