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44.  TRAILER BLACKOUT TAILLIGHTS DO NOT OPERATE (CONT) - TM-9-2320-364-20-2_780
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TM-9-2320-364-20-2 Truck Tractor Line Haul 52 000 GVWR 6x4 M915A2 Truck Tractor Light Equipment Transporter (Let) Manual
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44.  TRAILER BLACKOUT TAILLIGHTS DO NOT OPERATE (CONT).
TM 9-2320-364-20-2      2-1557 (1)   Set multimeter select switch to volts dc. (2)   Connect positive (+) multimeter lead to wire 1680C at trailer blackout taillight relay R17, terminal 87. (3)   Connect negative (–) multimeter lead to known good ground. (4)   Turn on BLACKOUT MARKER switch (TM 9-2320-364-10). (5)   Turn on BLACKOUT LIGHTS selector switch. (6)   Turn ON ENGINE switch. (a)   If 22 to 28 vdc are not present, perform Steps (7) through (10) below and replace relay R17 (Para 7-95). (b)   If 22 to 28 vdc are present, perform Steps (7) through (10) below and repair wire 1680C (see schematic Fig 2-35) or notify DS Maintenance. (7)   Turn OFF ENGINE switch. (8)   Turn off BLACKOUT LIGHTS selector switch. (9)   Turn off BLACKOUT MARKER lights switch. (10)   Install two ECB covers and 15 screws. (1)   Set multimeter select switch to ohms. (2)   Is there continuity on wire 1435 between trailer blackout taillight relay R17, terminal 85 and a known good ground? (a)   If there is no continuity, repair wire 1435 (see schematic Fig 2-35) or notify DS Maintenance. (b)   If there is continuity, wire 1435 is OK between relay R17, terminal 85 and first splice. CONTINUITY TEST Remove 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. Circuit breakers CB5, CB6, CB12, CB20, CB22, CB23 and relays R3, R13 - R19, R26, R28, R32, R33 are always electrically hot and can cause severe injury to personnel.  Care must be exercised when working under the electrical circuit board cover. VOLTAGE TEST NOTE Relay test must be performed with relay partially removed. NOTE Relay test must be performed with relay partially removed.

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