Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Battery Isolation Switch: Notes
The Battery Isolation Switch provides the vehicle with separate battery systems for the vehicle circuits and the starting circuit.
When the isolation switch is open, the vehicle circuit battery is the only power source connected to the power distribution center.
When the isolation switch is closed the starter battery is charged and the vehicle circuit battery is boosted by the starter battery.
Modes of the isolation switch:
- Starting Mode:
- Normal Starting.
- Safety Starting.
- Driving Mode.
- Charging Mode.
- Sleep Mode.
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.