Lit. No. 27366, Rev. 01 February 15, 2008
66
TROUBLESHOOTING GUIDE
SNOWPLOW PARK/TURN LAMPS*
Incorrect Operation or No Park/Turn Lamps
* Some applications may use the turn circuit for DRLs.
** Not applicable to NIGHTHAWK™ headlamps.
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/Cable/Plow Module 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.