Douglas Dynamics 77800-3 Installation Instructions Manual - Page 12

Browse online or download pdf Installation Instructions Manual for Automobile Accessories Douglas Dynamics 77800-3. Douglas Dynamics 77800-3 14 pages. Light truck snowplow

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OPERATIONAL TEST AND FINAL ADJUSTMENTS

VEHICLE LIGHTING CHECK

1. Verify the operation of all vehicle front lighting

prior to connecting the snowplow harness.

2. Check the operation of the snowplow lights with

snowplow mounted to vehicle and all harnesses

connected.

Turn signals and parking lamps

Parking lamps ON:

• Both vehicle and snowplow parking lamps

should be ON at the same time.

Driver-side turn signal ON:

• Both vehicle and snowplow driver‑side turn

signal lamps should flash at the same time.

Passenger-side turn signal ON:

• Both vehicle and snowplow passenger‑side

turn signal lamps should flash at the same time.

Headlamps

Move the vehicle headlamp switch to the

"ON" position. Connecting and disconnecting the

snowplow lighting harness plug should switch the

lights between vehicle and snowplow as follows:

Snowplow lighting harness DISCONNECTED:

• Vehicle headlamps should be ON.

• Snowplow headlamps should be OFF.

Snowplow lighting harness CONNECTED:

• Snowplow headlamps should be ON.

• Vehicle headlamps should be OFF.

The dimmer switch should toggle headlamps

between high and low beams. The high beam

indicator on the dash should light when headlamps

are placed in high beam.

Daytime Running Lamps (DRLs)

An operational check of the vehicle and snowplow

DRLs will depend on the vehicle model, vehicle

DRL system, and type of Isolation Module

installed. Due to the variations in the OEM DRL

systems and the different Isolation Module

options available, checking the functionality of the

snowplow DRLs will depend on the type of module

installed on the vehicle.

Lit. No. 52524, Rev. 05

With the headlamp switch OFF, activate the

vehicle DRLs.

Snowplow lighting harness DISCONNECTED:

• Vehicle DRLs should be ON.

• Snowplow headlamps should be OFF.

Snowplow lighting harness CONNECTED and

vehicle in DRL mode:

• Check snowplow DRL function per the type of

Isolation Module installed.

Refer to the Mechanic's Guide for information on

the Isolation Module DRL functions.

Control power indicator light

The snowplow plugs do need to be connected to

the vehicle harness connectors. The control power

indicator light should light whenever the control

ON/OFF switch and the ignition (key) switches are

both in the "ON" position.

3. Connect all snowplow and vehicle harnesses.

Raise the snowplow and aim the snowplow

headlamps according to the Snowplow Headlamp

Beam Aiming Instructions included with the

headlamps, and any state or local regulations.

4. Check the aim of the vehicle headlamps with the

snowplow removed.

Plug covers shall be used whenever

snowplow is disconnected. Vehicle battery

cable is 12V unfused source.

5. When the snowplow is removed from the vehicle,

install plug covers on the vehicle battery cable

and lighting harness. Insert the snowplow battery

cable and lighting harness into the cable boot on

the snowplow.

OWNER'S MANUAL PACKET

If the completed snowplow will be delivered

immediately, the Owner's Manual should be reviewed

with and given to the purchaser according to the

snowplow checklist.

If the snowplow is completed prior to delivery to the

purchaser, attach the Owner's Manual packet to the

electrical cable of the cab control for safekeeping.

CAUTION

July 15, 2020