Page 3
Introduction
Proper installation of this unit will allow operator of the vehicle to activate or deactivate a desired emer-
gency response device, such as a siren,
via
the transmission park neutral safety switch. There are several
ways to install this module, depending upon how and what the operator wants to activate or deactivate
when the transmission is in park. The following table indicates the state of each of the wires as determined
by the vehicle transmission.
DEVICE
TO BE
SWITCHED
MODULE
CUT
ENABLE
LINE
BLUE OR
GREY WIRE
(see text)
YELLOW
WIRE
WHITE WIRE
(to transmission
BLACK WIRE
(to chassis ground)
RED WIRE
(to POS battery)
neutral safety switch
negative ground signal)
WHITE
GREY
BLUE
YELLOW
Forward or Reverse Gear
Floating
Grounded
Open
Closed
Closed
Closed
Open
Closed
Park or Neutral
Installation
1. Disconnect the POSITIVE lead from the vehicle battery.
2. Connect the RED wire to +12VDC and fuse at 3 amps (customer supplied).
3. Connect the BLACK wire to chassis ground.
4. Connect the WHITE wire to the vehicle’s transmission park neutral safety switch ground signal.
5. Determine which wire is the enable wire for the device to be switched. Depending on the device, this
could be the POS, the NEG wire or the control wire.
6. Cut the device’s enable wire. Connect the YELLOW wire to the enable wire coming from the device.
NOTE: This relay has a maximum switching current of 30 amps.
7. The remaining connection is determined by how the user wishes the device to function when the
transmission is shifted into park:
•
If the user wants the device to be inactive when the vehicle is in park, connect the BLUE wire to
the remaining end of the device’s enable wire.
•
If the user wants the device to be active when the vehicle is in park, connect the GREY wire to the
remaining end of the device’s enable wire.
8. Reconnect the POSITIVE lead to the vehicle battery and confirm proper operation of the device.
For information on the installation of the WPKM1 with specific Whelen Engineering products, please refer
to page 3.
IMPORTANT! Installation of this equipment may effect the vehicle warranty. Whelen
Engineering recommends that the vehicle manufacturer be contacted to learn what effect,
if any, this product will have on warranty considerations.
