Snowplow Drls - Western HTS Mechanic's Manual

TROUBLESHOOTING GUIDE
SNOWPLOW DRL LAMPS*
Incorrect Operation or No DRL Lamps
BASIC CHECK QUESTIONS
1 Fully understand OEM DRL operation
2 OEM headlamps and DRLs operating correctly
3 OEM DRL fuse tests good
4 Harnesses connected between vehicle and snowplow (all)
5 Corrosion at harness connectors
6 Ignition on
7 Does control power up with key on
8 Snowplow headlamp and park/turn lamps all working correctly
9 Correct isolation module kit installed for application
10 Isolation module and harnesses correctly installed per instructions
11 Harness wired per drawing
12 Bulb burned out
* 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.
Lit. No. 41467, Rev. 01
SOLUTIONS
Refer to vehicle owner's manual for DRL operation.
OEM headlamps must be fully operational for correct isolation module operation.
Refer to vehicle owner's manual for fuse location and size.
Harnesses must be connected for all snowplow and headlamp functions.
Replace as needed.
Ignition must be ON for snowplow DRL operation.
Go to Control/Cable/Plow Module Test.
See electrical schematics in this guide.
Verify per Quick Match at www.westernplows.com.
Refer to isolation module instructions.
See electrical schematics in this guide.
Replace with proper bulb.
65
April 15, 2021