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) Open engine access panel (TM 10-3930-669-10). (2) Set multimeter select switch to VOLTS DC. (3) Connect positive (+) multimeter lead to glow plug one at a time. (4) Connect negative (-) multimeter lead to a known good ground. (5) Set MAIN POWER switch to ON position (TM 10-3930-669-10). (6) Set engine switch to ignition position (TM 10-3930-669-10). (7) Check VOLTS DC between glow plug and a known good ground one at a time, while holding glow plug button depressed. (a) If 22 to 24 vdc are not measured, replace glow plug (Para 7-7). (b) If 22 to 24 vdc are measured, glow plug(s) are OK. (8) Set MAIN POWER switch to OFF position. (9) Set engine switch to off position. (10)Close engine access panel (TM 10-3930-669-10). 2-43