Lit. No. 27366, Rev. 01 February 15, 2008
67
TROUBLESHOOTING GUIDE
SNOWPLOW DRL LAMPS*
Incorrect Operation or No DRL Lamps
* Snowplow DRLs operate as a series circuit and will illuminate bulb at 1/2 intensity. In some applications, the OEM DRLs will stay illuminated with snowplow attached.
BASIC CHECK QUESTIONS SOLUTIONS
1
Fully understand OEM DRL operation Refer to vehicle owner's manual for DRL operation.
2
OEM headlamps and DRLs operating correctly OEM headlamps must be fully operational for correct Isolation Module operation.
3
OEM DRL fuse tests good Refer to vehicle owner's manual for fuse location and size.
4
Harnesses connected at vehicle and snowplow (all) Harnesses must be connected for all snowplow and headlamp functions.
5
Corrosion at harness connectors Replace as needed.
6
Ignition ON Ignition must be ON for snowplow DRL operation.
7
Does control power up with key ON
Go to Control/Cable/Plow Module Test.
8
Snowplow headlamp and park/turn lamps all working correctly
See wiring diagram in this guide and go to Harness Tests.
9
Correct Isolation Module kit installed for application Verify per Quick Match at www.westernplows.com.
10
Isolation Module and harnesses correctly installed per instructions Refer to Isolation Module instructions.
11
Harness wired per drawing Refer to Electrical Schematics Guide.
12
Bulb burned out Replace with proper bulb.
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