RAC Plus User’s Manual
2-2
2-3
Installing the
Modular Distance Sensor
Most vehicles (1992 and newer) have an electronic speed output rather than
a mechanical speedometer cable coming from the transmission. With these
vehicles you will need to install either a Modular Distance Sensor (MDS)
Vehicle Kit or a Modular Distance Sensor Quick Kit. Use the following
instructions for installation of the MDS Kits.
1. Find a location under the vehicle
dashboard that will allow fairly easy
access to the MDS. Do Not mount the
MDS on the heater ducts or where the
heater vents will blow directly onto it.
Attach the MDS using the nylon ties or
Velcro provided, as shown in Fig. 2.1.
2. Locate the 2 wires coming from the
Vehicle’s Speed Sensor (VSS).
• On most Ford and Chrysler pick-up trucks, the best place is on the rear
end differential housing using the rear ABS signal. On 2005 and later
Ford trucks, connect at the top rear of the transmission tail shaft (on
4x4 where the transmission meets the transfer case) with the JAMAR
red wire to the vehicle's blue/yellow wire. Leave the JAMAR black
wire disconnected.
• On General Motors pick-up trucks, the best place is the VSS at the
transmission.
• On many vehicles (both trucks and autos)
you can go to the cruise control signal or to
the vehicle ECU which is often located under
the dashboard.
(Note: Vehicle wiring changes from year to year
and model to model. For technical support in locating the vehicle speed
signal wire call JAMAR at 215-491-4899. Your local Auto/Truck dealer can
also usually tell you where the VSS can be located on your vehicle.)
3. Route the red and black end of the 20’ grey VSS cable through the re-
wall. This can usually be done by using an existing rubber grommet where
Chapter 2 — Installation
All wires and the
MDS itself should
be kept away from
any heat source that
could cause melting.
Fig. 2.1
MDS Mounted Under Dash
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