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34.  ENGINE BRAKE DOES NOT OPERATE IN LOW (CONT) - TM-9-2320-364-20-2_686
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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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34.  ENGINE BRAKE DOES NOT OPERATE IN LOW (CONT) - TM-9-2320-364-20-2_688
TM 9-2320-364-20-2      2-1463 (1)   Loosen screw and disconnect vehicle harness connector MC18. (2)   Connect a jumperwire between wire 508 at vehicle harness connector MC18, terminal A, and a known good ground. (3)   Set multimeter select switch to ohms. (4)   Is there continuity between relay R7, terminal 85 and a known good ground? (a)   If there is no continuity, repair wire 508 (see schematic Fig 2-38) or notify DS Maintenance. (b)   If there is continuity, wire 508 is OK. (5)   Connect vehicle harness connector MC18 and tighten screw. (6)   Close engine top cover. 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 Connector terminals are easily damaged.   Use care when connecting or disconnecting terminals. NOTE Relay test must be performed with relay partially removed. On DDEC III trucks, wire 988 replaces wire 508.

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