Lit. No. 27366, Rev. 01 February 15, 2008
65
TROUBLESHOOTING GUIDE
SNOWPLOW HEADLAMPS
Incorrect Operation or No Headlamps
BASIC CHECK QUESTIONS SOLUTIONS
1
DRL mode/automatic headlamp function Fully understand OEM headlamp operation; refer to vehicle owner's manual.
2
Harnesses connected at vehicle and snowplow (all) Harnesses must be connected for all snowplow and headlamp functions.
3
Corrosion at harness connectors Replace as needed.
4
Ignition ON Ignition switch or vehicle park lights must be ON for snowplow headlamps to operate.
5
Control powers up with key ON
Go to Control/Cable/Plow Module Test.
6
Correct Isolation Module kit installed for application Verify per Quick Match at www.westernplows.com.
7
OEM lights operating correctly prior to installation OEM headlamps must be fully operational for correct Isolation Module operation.
8
OEM fuse tests good Replace with proper fuse.
9
Bulb burned out Replace with proper bulb.
10
Plugged into OEM headlamp correctly Connect per Isolation Module instructions.
11
Harnesses in correct location at Isolation Module and installed per
installation instructions
Install using Isolation Module instructions.
12
Harnesses configured correctly for HB-1/HB-5 and/or kits using
adapters
Install using Isolation Module instructions or Electrical Schematics Guide.
13
Configuration plug correct (if required) Refer to Isolation Module instructions or Electrical Schematics Guide.
14
Correct harnesses and/or Isolation Module in kit Refer to Electrical Schematics Guide.
15
Harness wired per drawing Refer to Electrical Schematics Guide.
16
Verify power and ground in proper pin locations at Isolation
Module
See wiring diagram in this guide and go to Harness Tests.
17
Verify power and ground in proper pin locations to vehicle
headlamp
See wiring diagram in this guide and go to Harness Tests.
18
Test Isolation Module with Isolation Module tester Test using instructions supplied with tester.
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