From Unofficial Zero Manual
The kill switch (or engine cutoff/cutout switch) is a toggle switch on the right handlebar switch assembly prevents motor operation as a separate control from other interlocks.
- On the right handlebar switch assembly.
- Push up/forward to cutoff motor operation.
- Push down to enable motor operation.
- When to Cutoff Motor Operation
- Whenever the bike should not be operating.
- This is a redundant safety mechanism to prevent injury or damage.
- If the vehicle is on its side after a crash or other incident.
- This prevents spinning up the wheel.
- Whenever someone unfamiliar with the motorcycle is sitting on it or nearby.
- If they intentionally or unintentionally touch the throttle, this prevents their lack of familiarity from causing a surprise excursion.
- The status command in the MBB console can report its reading.
- While energized, a voltmeter will indicate 5V across the input leads if the switch is open, and 0V if shut.
- While de-energized (and confirmed), resistance across the switch will be high if open, and low if shut.