BENDIX MC-12 MODULATOR CONTROLLER ASSY Manual page 11

START HERE
POWER A & B
TRAILER STATUS
LAMP D
A B C D E F G H J K L M N P
EC-12 ™ CONTROLLER
WIRE HARNESS CONNECTOR
Troubleshooting
SECTION I
TRAILER STATUS LAMP TESTING
WITH TRACTOR IGNITION OFF, DISCONNECT
14 PIN WIRE HARNESS CONNECTOR FROM
™
EC-12 CONTROLLER THEN TURN TRACTOR
IGNITION ON AND MAKE AND HOLD A BRAKE
APPLICATION.
USING A JUMPER WIRE CONNECT PIN A TO D THEN B
TO D. WITH THE CONNECTION IN PLACE NOTE THE
CONDITION OF TRAILER STATUS LAMP.
TRAILER STATUS LAMP ON?
CHECK THE FOLLOWING IN THE ORDER PRESENTED AND
AFTER REPLACING OR TESTING EACH COMPONENT,
TEST THE STATUS LAMP OPERATION:
1. CHANGE TRAILER STATUS LAMP BULB
2. CHECK TRAILER STATUS LAMP WIRING-GROUND
3. CHECK CONTINUITY OF WARNING WIRE BETWEEN PIN
D ON THE 14 PIN CONNECTOR AND THE TRAILER STATUS
LAMP SOCKET
REPEAT THE "INITIAL
START-UP PROCEDURE".
YES
NO
REPLACE EC-12 ™
CONTROLLER AND RETEST.
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