Douglas Dynamics Western 26470-2, Operating Instructions Manual, Page: 12 / 14

Lit. No. 26473, Rev. 03 12 November 1, 2007
ISOLATION MODULE TEST PROCEDURE – 3-PORT MODULES
ISOLATION MODULE 29070 (GREEN
LABEL) OFF-VEHICLE TEST
Set-Up
Before connecting the Isolation Module Tester to the
Isolation Module, ensure the Isolation Module Tester
switches are in the following positions.
Connection – Requires Adapter 29294-1
Connect the Isolation Module Tester to the 29294-1
adapter and module as follows:
1. Connect Isolation Module Tester cable 1 to
adapter connector 1.
2. Connect Isolation Module Tester cable 2 to
Isolation Module connector A.
3. Connect Isolation Module Tester cable 3 to
adapter connector 3.
4. Connect adapter cable connector B to Isolation
Module connector B.
5. Connect Isolation Module Tester cable 4 to
adapter connector 4.
6. Connect adapter cable connector C to Isolation
Module connector C.
7. Connect the Isolation Module Tester power cable
to a 12V power source by attaching the red
alligator clip to POSITIVE (+) and the black
alligator clip to NEGATIVE (–).
Test Vehicle Lights
1. Place the Isolation Module Tester POWER switch
in the "ON" position. The green POWER indicator
should light.
2. Place the PARK LAMP switch in the "ON" position.
The left and right side tester vehicle LOW BEAM
indicators should light.
3. Place the HEADLAMP switch in the "HIGH"
position. The tester vehicle HIGH BEAM indicators
should light.
Test Snowplow Lights
1. Place the PLOW ATTACHED switch in the "ON"
position. The green PLOW ATTACHED indicator
should light and both plow HIGH BEAM indicators
and the plow PARK LIGHTS indicator should light.
2. Place the HEADLAMP switch in the "LOW"
position. The plow LOW BEAM and PARK LIGHTS
indicators should now light.
3. Place the IGNITION SWITCH in the "ON" position.
The green IGNITION SWITCH and CONTROL
POWER indicators should light.
4. Press and hold the TURN SIGNAL switch in the
"LEFT" position. The plow left TURN SIGNAL
indicator should light. Release the switch.
5. Press and hold the TURN SIGNAL switch in the
"RIGHT" position. The plow right TURN SIGNAL
lamp should light. Release the switch.
6. Place the PARK LAMP switch in the "OFF"
position. The plow LOW BEAM and PARK LIGHTS
indicators should turn OFF.
7. Place the DEDICATED DRL BULB SYSTEM
switch in the "ON" position. The plow TURN
SIGNAL indicators should light.
8. Press and release the TURN SIGNAL switch in the
"LEFT" position. The plow left TURN SIGNAL
indicator should momentarily turn OFF then back ON.
9. Press and release the TURN SIGNAL switch in the
"RIGHT" position. The plow right TURN SIGNAL
indicator should momentarily turn OFF then back ON.
10. Return the DEDICATED DRL BULB SYSTEM
switch to the "OFF" position.
The Isolation Module Test is complete. Turn Isolation
Module Tester OFF and disconnect Isolation Module.
Disconnect Isolation Module Tester from power source.
Isolation Module Tester Switch Position
POWER OFF
PARK LAMPS
OFF
HEADLAMPS LOW
PLOW ATTACHED
NO
IGNITION SWITCH OFF
HEADLAMP COMMON NEG (–)
HIGH BEAM #2 OFF
DEDICATED DRL BULB SYSTEM OFF