Lit. No. 41298, Rev. 01 February 15, 2019
29
THEORY OF OPERATION
White Label Non-DRL Module
(PN 29060)
NOTE: Module has been replaced by
PN 29070-1.
Snowplow not attached to vehicle:
System is inactive. Vehicle lighting system
functions normally.
Reason: No ground to module.
Snowplow attached to vehicle:
System is inactive until either the switched
accessory wire or the vehicle parking lights are
activated. Vehicle and snowplow lighting systems
function as outlined in the Theory of Operation
overview.
Reason: Ground path is established from battery
common to pin C on port A of the 3-port module
via the following harnesses: vehicle battery cable,
vehicle control harness, plug-in harness, vehicle
lighting harness, and snowplow lighting harness.
3-PORT MODULE ELECTRICAL
• Activating a switched accessory wire (a
key-controlled power source) applies battery
voltage to the VACC input of the module,
which energizes the coil of the control power
relay (part of the 3-port module). Energizing
the coil of the control power relay causes the
relay contacts to shift from the "N.O." (normally
opened) position to the "N.C." (normally closed)
position, which supplies battery voltage to
the snowplow control via the plug-in harness
and the vehicle control harness. The switched
accessory wire only controls battery voltage to
the snowplow control.
• Activating the vehicle park light circuit applies
battery voltage to the module park circuit input.
The voltage is applied to a solid state power
device, which causes the device to turn ON
and apply battery voltage to the snowplow park
lamp fi laments via the vehicle and snowplow
lighting harnesses. Voltage is also applied to
the module's high and low beam relay coils,
which causes the relay contacts to shift from
the "vehicle" to the "snowplow" position.
• With the four headlamp relays shifted to the
"snowplow" position, the vehicle high and
low beams are now directed to the snowplow
headlamps via the vehicle and snowplow
lighting harnesses. Toggling the dimmer switch
between high and low beam will toggle the
snowplow high and low beams.
• Activating the turn signal applies battery
voltage to the module turn signal circuit input.
The voltage is applied to a solid state power
device, which causes the device to turn ON
and apply battery voltage to the snowplow
turn signal lamp fi laments via the vehicle and
snowplow lighting harnesses.
• On vehicles equipped with DRLs—either
integrated into the vehicle headlamps or
separated into dedicated DRL lamps—this
module will not turn OFF the vehicle DRLs
or transfer them to the snowplow. DRLs will
remain on the vehicle and operate as the
vehicle manufacturer intended.
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