Lit. No. 41298, Rev. 01 February 15, 2019
59
TROUBLESHOOTING
SNOWPLOW DRL LAMPS*
Incorrect Operation or No DRL Lamps
BASIC CHECKS 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 between 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 electrical schematics in this guide.
9 Correct Isolation Module kit installed for application. Verify per eMatch at www.fi sherplows.com.
10 Isolation Module and harnesses correctly installed per instructions. Refer to Isolation Module instructions.
11 Harness wired per drawing. See electrical schematics in this guide.
12 Bulb burned out. Replace with proper bulb.
* 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.
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