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 and R33 are
always electrically hot and can cause severe injury to personnel. Care must be exercised when
working under the electrical circuit board cover.
Is there continuity on wire 1435 between relay
R20, terminal 85 and a known good ground?
(1) If there is no continuity, replace
CTIS controller (Para 13-7).
(2) If there is continuity, CTIS
controller is OK.
Relay test must be performed with relay
(1) Set multimeter select switch to volts
(2) Connect positive (+) multimeter lead
to INTERAXLE relay R20, terminal 87.
(3) Connect negative () multimeter lead
to a known good ground.
(4) Turn ON ENGINE switch
(a) If 10 to 14 vdc are not
present, turn OFF ENGINE switch
and replace relay (Para 7-95).
(b) If 10 to 14 vdc are present,
turn OFF ENGINE switch and
repair wire 1889 (see schematic
Fig 2-72), or notify DS
(5) Install 15 screws and two ECB covers.