Snowplow Park/Turn Lamps - Western HTS Mechanic's Manual

TROUBLESHOOTING GUIDE

SNOWPLOW PARK/TURN LAMPS*

Incorrect Operation or No Park/Turn Lamps
BASIC CHECK QUESTIONS
1 OEM park/turn lamps working
2 Harnesses connected between vehicle and snowplow (all)
3 Clean harness connectors
4 Ignition on
5 Control powers up with key on
6 15A park/turn fuse good in #1 harness
7 Black/orange "ground" wire connected to motor ground stud**
8 Spliced into OEM park/turn circuit correctly
Harnesses in correct location at isolation module and installed per
9
installation instructions
10 Harness wired per drawing
11 Verify power and ground in proper pin locations at isolation module
12 Verify power and ground in proper pin locations to vehicle headlamp
13 Bulb good
* Some applications may use the turn circuit for DRLs.
** Not applicable to NIGHTHAWK™ headlamps.
Lit. No. 41467, Rev. 01
SOLUTIONS
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 headlamps to operate.
Go to Control/Cable/Plow Module Test.
Replace with proper fuse.
Refer to isolation module instructions.
Refer to isolation module instructions.
Install using isolation module instructions.
See electrical schematics in this guide.
See electrical schematics in this guide.
See electrical schematics in this guide.
Replace with proper bulb.
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April 15, 2021