Sierra Wireless MP 881W, User Manual

Page: 28 / 88

MP881W Modem User Guide
22 2130808
Use the supplied mounting screws and washers to secure the
MP modem through the holes along the edge of the case
bottom.
Figure 3-3: Mounting the MP modem. Arrows indicate the mounting holes. The
front cover is open for illustration purposes only. Close it before mounting.
Ground the MP modem
Note: Electrical installations are potentially dangerous and should be
performed by personnel thoroughly trained in safe electrical wiring
procedures for vehicles.
Automotive installations usually provide a good quality
ground for each piece of electrical equipment. In most cases,
ground the MP modem by connecting the black ground wire
of the power harness to either the vehicle chassis or to the
negative terminal of the battery.
If a device connected to the MP modem, such as a notebook
computer, is not properly grounded, it may ground itself
through the cable connecting it to the MP modem. This creates
a hazard and could cause equipment damage. If you cannot
properly ground a device, a potential solution is to install a
fuse in the ground return wire.
The power harness has 5 A fuses on the red power wire and
the white ignition sense wire, but not on the black ground
return wire. (See “Step 3 — Install the power harness” on
page 25.)