TM 9-2320-364-20-22-1621(1) Disconnect connector MC22.(2) Set multimeter select switch to ohms.(3) Is there continuity measured on pin in position 5 on connector MC22 and a known good ground?(a) If there is no continuity, repair black wire (see schematic Fig 2-39) and connectconnector MC22.(b) If there is continuity, black wire is OK.CONTINUITY TESTRemove all jewelry such as rings, dog tags, bracelets, etc. If jewelry or tools contact positive electrical circuits, a direct short may result. Damage to equipment, injury or death to personnel may occur.