DRAFT 3 – JANUARY 10, 2005 NOT FOR RELEASE
ORBITGPS USER GUIDE
SERIAL GPS RECEIVERS
9
Connecting the OrbitGPS Serial GPS Receiver Direct Wire Version
(OrbitGPS Part Number G1040) to Vehicle Cradles
Step 1
To connect the Serial GPS to the vehicle cradle, plug the DB9 Serial connector into the
serial port found on the bottom of the cradle to the left of the power cable. Tighten the DB9
serial connector with the thumbscrews to ensure a secure connection.
Step 2: Installation instructions for direct wire power cable
Read the following instructions completely before beginning.
WARNING: A properly trained technician must perform the power connection.
Improper connection can damage the vehicle or GPS receiver.
To connect the GPS receiver power cable to power:
1. Locate the Vehicle Power Source.
Note: An accessory output in the vehicle’s fuse panel is the ideal location for connecting
the power cable. The power cable should be added to a circuit with a maximum load
capacity for the GPS recevier and the original circuit. Refer to the vehicle’s owner’s
manual for identification of circuit. If a fused output is not available, an inline fuse holder
with UL-listed fuse should be used (fuse should be rated 4A for 24V operation and 5A for
12V operation). The fuse protects the vehicle from an electrical short on the power line to
the GPS receiver.
To provide constant power to the GPS receiver, shut the vehicle’s ignition, then connect
the power cable to unswitched power.
2. Route the power cable from the connection with the GPS receiver to the connection
point for the vehicle’s power source.
Caution: The means of routing and securing the power input cable from the GPS receiver
through to the vehicle power source is extremely important. Hazards associated with
improper wiring can be severe. To avoid unintentional contact between the wire and any
sharp edges, provide the cable with proper brushings and clamping where it passes
through openings. If the wire is subject to sharp surfaces and excess engine vibration, the
wiring harness can wear away, causing a short between the bare wires and chassis. This
can start a fire.
3. Prepare the cable termination.
a. Red wire: connect to a +12/24V vehicle power source.
b. Black wire: connect to vehicle ground or chassis ground.
Note: How the cable terminates depends on the vehicle. If the vehicle has a power output
connector, attach a mating connector to the end of the power cable. You may be able to
connect to a fuse panel with a simple blade terminal or commercially available connector.
