Lit. No. 28270, Rev. 00
July 1, 2005
68
TROUBLESHOOTING GUIDE
HEADLAMP TROUBLESHOOTING – SNOWPLOW PARK/TURN LAMPS*
Incorrect Operation or No Park/Turn Lamps
* Some applications may use the turn circuit for DRLs.
BASIC CHECK QUESTIONS
SOLUTIONS
1
OEM park/turn lamps working
Refer to vehicle owner's manual for fuse location and size.
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 must be "on" for snowplow headlamps to operate.
5
Control powers up with key on
Go to
Control Test.
6
15-amp park/turn fuse good in #1 harness
Replace with proper fuse.
7
Black/orange "ground" wire connected to motor ground stud
Refer to Isolation Module instructions or Electrical Schematics Guide.
8
Spliced into OEM park/turn circuit correctly
Refer to Isolation Module instructions.
9
Harnesses in correct location at Isolation Module and installed per
installation instructions
Install using Isolation Module instructions.
10
Harness wired per drawing
Refer to Electrical Schematics Guide.
11
Verify power and ground in proper pin locations at Isolation
Module
See wiring diagram in this guide and
go to
Harness Tests.
12
Verify power and ground in proper pin locations to vehicle
headlamp
See wiring diagram in this guide and
go to
Harness Tests.
13
Bulb burned out
Replace with proper bulb.