rex's7

hi everyone, im in the process of wiring a E6K and i completely removed the harness to wire a standalone..well i just realized that in the main harness the wire for the low level warning is attached to it...i still have some the smain ecu connectors and harness still in the car but i have no harness in the engine bay....so i need to find that wire to ground...so i figured here are my options...

1. where i can track that wire down somewhere else in the car to ground it
2. or where could i disable that "buzzer" noise from?

any help or ideas are much appreciated!