(1) Remove 15 screws and two ECB
(2) Set multimeter select switch to volts
(3) Connect positive (+) multimeter lead
to wire 1280 at circuit breaker CB21.
(4) Connect negative () multimeter lead
to a known good ground.
(5) Turn ON ENGINE switch
(a) If 22 to 28 vdc are not present,
turn OFF ENGINE switch and
repair wire 1280 (see schematic
Fig 2-25) or notify DS
(b) If 22 to 28 vdc are present,
wire 1280 is OK.
(6) Turn OFF ENGINE switch.
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.