Lit. No. 41298, Rev. 01 February 15, 2019
37
THEORY OF OPERATION
Snowplow Headlamps
The Isolation Module acts as an electrical hub,
automatically directing vehicle power to the
appropriate vehicle or snowplow lighting devices,
while also supplying battery power to the snowplow
control.
The vehicle high and low beams enter and exit the
Isolation Module through port 3 (left-side lighting)
and port 4 (right-side lighting). Park, turn and DRL
signals also enter through ports 3 and 4. The
output of the vehicle dimmer switch is directed to
the Isolation Module via the long and short plug-in
harnesses.
All snowplow lighting exits the Isolation Module
through port 2.
When the snowplow is not attached to the vehicle,
the signal passes through the normally closed
relay contacts to the vehicle headlamps. During
this time, the Isolation Module is inactive, placing
no current draw on the vehicle's electrical system.
With the snowplow attached, the Isolation Module
is still inactive until either of the two following
conditions are met: The vehicle parking lights are
turned ON or the vehicle ignition switch is turned
ON.
Turning ON the vehicle parking lights activates
a series of relays, automatically transferring the
vehicle high and low beams to the snowplow while
supplying battery power directly to the snowplow
parking lights.
Turning ON the vehicle ignition switch energizes a
snowplow control relay, supplying vehicle battery
power directly to the control via the vehicle control
harness. The vehicle ignition switch also supplies
power to the vehicle turn signals. Activating the
vehicle turn signals energizes turn signal relays,
which supply vehicle battery power directly to the
snowplow turn signals.
4-PORT MODULE ELECTRICAL
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