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 |  TM 9-2350-238-20-1 Make sure MASTER switch is OFF before repairing electrical circuits. Failure to observe this warning could result in injury to personnel. Step 3. Disconnect lead 480A from fuel pump bypass solenoid valve. Place red probe in lead 480A. Ground black probe. Set MASTER switch ON. Hold PRIME ENGINE FUEL FILTERS/HEATER FUEL CYCLE ON AND OFF switch ON. If multimeter indicates about 24 volts, notify direct support maintenance. If multimeter indicates no voltage, repair lead 480A between PRIME ENGINE FUEL FILTERS/HEATER FUEL CYCLE ON AND OFF switch and solenoid. Refer to page 2-371. Set MASTER switch OFF. Release PRIME ENGINE FUEL FILTERS/HEATER FUEL CYCLE ON AND OFF switch. Connect lead. 2-299 | 
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