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AirLink MP595 / MP595W Modem User Guide
34 2130795
onwhentheignitionisswitchedto“A ccessory”mode.In
thisconfiguration,theMPmodemisonwheneverother
vehicleelectricaldevicescanbeswitchedon—suchaswhenthe
radioandwindshieldfancanrun.
—or—
Note: If you choose to install a
separate switch, it must be
connected to the white ignition
sense wire, not the red battery
wire, so that the MP modem can
perform a controlled shutdown,
as described on page 33.
• Separatelyswitched.Connectthewhiteignitionsense
wiretoaseparateswitchmountedinaconvenient
location,whichallowstheMPmodemtobeturnedonor
offregardlessofthepositionoftheignitionkey.Inthis
configuration,theMPmodemcanbepoweredonoroff
evenif
thekeyisnotintheignition.
TheMPmodemalsohasa“PowerOffTimer”.Whenpoweris
removedfromtheignitionsensewire,theMPmodemremains
onfortheperioddefinedbythePowerOffTimer,uptoa
maximumof240minutes.ThePowerOffTimerisconfigured
in3GWatcher.Seetheonline
helpin3GWatcherfordetails.
Ground the power harness
Youmustconnecttheblackgroundwirefromthepower
harnesstothegroundednegativeterminalofthevehicle
battery,oranotherappropriateelectricalground.Failingto
groundthepowerharnessproperlymaydamagetheMP
modem,maycauseradiointerference,andcanbedangerous.
(
See“GroundtheMPmodem”onpage28.)Thegroundwire
intheMPmodempowerharnessisnotfused.
Power connections
ConnectingtheMPmodem’spowerwiresproperlyis
important—poorconnectionscandamagethewiring,theMP
modem,orthevehicle’selectricalsystem,andcanbe
dangerous.
Note: Ensure that all wires are
correctly spliced or crimped.
Improper grounding and wire
connections may lead to
equipment damage or safety
hazards.
Correct wire splicing
Youcansplicethewiresofthepowerharnesstothecarwiring.
PropersplicingisessentialtoreliableoperationoftheMP
modem.DoNOTuse“quicktaps”;theyreducetheintegrityof
thewirethatiscutandletmoistureintothecable.
Anappropriatemethodofsplicingistostripasmallportionof
theinsulation,solderthewirestogether,thenheat‐shrinkthe
connectiontore‐insulateit.
Crimp terminals
Ifsuitableterminalconnectionpointsareavailableonthe
vehicleforpowerandignitionsense,thenusingautomotive
crimpterminalsisrecommended.Whenusingcrimp