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MP 555 GPS Vehicle Installation Guide
Note: Failing to prov
dedicated ground for each
piece of electrical equipment
can damage the equipment.
Note: If you are replacing an
MP200 modem, you can use the
MP200 power harness rather
than install ng the MP 555 GPS
i
power harness. The only
difference between the
harnesses is that the MP200
harness has a fused ground wire
whil
e the MP 555 GPS harness
has an unfused ground wire.
18
Grounding the Modem
It is standard practice in automotive installations to provide a
ide a
good quality ground for each piece of electrical equipment. In
most cases, the modem should be grounded by connecting the
black ground wire of the power harness either to the vehicle
chassis or to the negative terminal of the battery.
If other devices connected to the modem (such as a notebook
computer) are not properly grounded, there is some risk that
the other device will ground itself through the cable
connecting it to the modem. This creates a hazardous situation
and could cause equipment damage. If you cannot properly
ground these devices, a potential solution is to install a fuse in
the ground return wire.
The power harness for the MP 555 GPS modem has 5 A fuses
on the red power wire and the white ignition sense wire, but
not
on the black ground return wire. (See "Power Wiring" on
page 20.)
Figure 2-7: The ground screw connector (bottom) on the connector panel.
To facilitate other ground schemes, a ground screw is
provided on the connector panel of the MP 555 GPS. Use of
this ground screw is not required as long as the power harness
is properly grounded. (Use a 16-gauge wire if you choose to
use the ground screw.
Note: All electrica nstallations are potentially dangerous, and should
be performed by personnel with thorough training n safe e
wiring procedures for veh
Ground screw
)
l i
icles.
i
lectrical
2130297
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