TM 10-3930-669-20 WARNING Remove all jewelry such as rings, dog tags, bracelets, etc.  If jewelry contacts battery terminal, a direct short may result in instant heating of tools, damage to equipment, and injury or death to personnel. VOLTAGE TEST (1) Set multimeter select switch to VOLTS DC. (2) Connect positive (+) multimeter lead to main power switch, output terminal. (3) Connect negative (-) multimeter lead to a known good ground. (4) Set MAIN POWER switch to ON position (TM 10-3930-669-10). (a) If there are not 22 to 24 vdc present, perform Step (5) below and replace main power switch (Para 7-15). (b) If there are 22 to 24 vdc   present, main power switch is OK. (5) Set MAIN POWER switch to OFF position. (6) Close engine access panel (TM 10-3930-669-10). 2-33