Douglas Dynamics Western 26470-2 Operating Instructions Manual - Page 6

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ISOLATION MODULE TEST PROCEDURE – ALL MODULES

TEST PREPARATION

CAUTION

Read this document before testing any

snowplows.

•

When connecting the Isolation Module Tester to

the battery, connect the red clip to the

POSITIVE (+) terminal and the black clip to the

NEGATIVE (–) terminal. Connect the black clip

last. When disconnecting, disconnect it first.

•

If an Isolation Module Tester lamp (tester lamps

are white, tester LEDs are green and slightly

smaller) does not come ON, the fault could be an

open lamp element, an open circuit, or both.

•

All vehicle lamps must be operational. An open

lamp may cause false test results.

•

The Isolation Module Tester is protected by a fuse

inside the tester that automatically resets itself. If

the fuse activates, disconnect power from the

Isolation Module Tester and wait several minutes.

Then resume the test.

Lit. No. 26473, Rev. 03

ISOLATION MODULE ON-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.

Isolation Module Tester Switch

POWER

PARK LAMPS

HEADLAMPS

PLOW ATTACHED

IGNITION SWITCH

HEADLAMP COMMON

HIGH BEAM #2

DEDICATED DRL BULB SYSTEM

Connection

Connect the Isolation Module Tester to the Isolation

Module as follows:

1. 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 (–).

2. Connect the Adapter Cable (PN 26472) to the

Isolation Module Tester harness 2.

3. Connect the molded connector of the Adapter Cable

to the vehicle lighting harness connector located at

the grille of the vehicle. Isolation Module Tester

harnesses 1, 3 and 4 are not used for this test.

Test Procedure

1. Turn the vehicle's ignition ON, but do not start

engine. Verify the vehicle's lights function properly

by cycling the vehicle's park, turn, hazard, high

beams, low beams and DRL lamps. Then place

the vehicle's headlamp switch in the "low beam"

position. Turn OFF all vehicle lighting. Repair or

replace any defective vehicle lamps before

proceeding.

2. Turn the Isolation Module Tester POWER switch

to the "ON" position. Only the POWER indicator

should light.

Position

OFF

LOW

OFF

NEG (–)

OFF

November 1, 2007