GMC 1976 ZEO 6083 Maintenance Manual page 733

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Figure 1-Checking Compressor Voltage
120-volt A. C., 60 cycles/sec ., will produce a true
sine which an A.C. voltmeter is designed to read .
A.C. OPERATION
Using a standard A .C . voltmeter the voltmeter
reading should be 22 to 24 volts.
REFRIGERATOR 2413- 3
Figure 3-Checking Thermostat at Inverter
If the voltage at the compressor is not adequate
the voltage source should be checked.
D.C. OPERATION
Using a standard A.C . voltmeter the voltmeter
reading should be 31 .5 to 33 .5 volts.
COMPRESSOR AMPERAGE
One method of determining whether or not the
Figure 2-Checking Compressor Amperage Figure 4-Jumper Wire at Thermostat