Cessna Skyhawk 172N Pilot Operating Handbook page 39

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SECTION 3
MODEL 172N
EMERGENCY PROCEDURES
LOW-VOLTAGE LIGHT ILLUMINATES DURING FLIGHT
(Ammeter Indicates Discharge)
NOTE
Illumination of the low-voltage light may occur during
low RPM conditions with an electrical load on the system
such as during a low RPM taxi. Under these conditions, the
light will go out at higher RPM. The master switch need not
be recycled since an over-voltage condition has not
occurred to de-activate the alternator system.
1.
Avionics Power Switch -- OFF.
2. Master Switch -- OFF (both sides).
3. Master Switch -- ON.
4. Low-Voltage Light -- CHECK OFF.
5. Avionics Power Switch -- ON.
If low-voltage light illuminates again:
6. Alternator -- OFF.
7. Nonessential Radio and Electrical Equipment -- OFF.
8. Flight -- TERMINATE as soon as practical.
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