(1) Loosen screw and disconnect harness
(2) Connect a jumperwire between
harness connector MC9 terminal 3F
wire 211 and a known good ground.
(3) Set multimeter select switch to ohms.
(4) Is there continuity between connector
MC9, terminal 3F and retarder relay
R8, terminal 30?
(a) If there is no continuity, repair
wire 211 (see schematic Fig 2-38)
or notify DS Maintenance.
(b) If there is continuity, wire 211
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.
Relay test must be performed with relay