Global Positioning Systems, or GPS devices, for a vehicle can be purchased as plug and play units, remote mounted units or installed in the dash. Hard wiring a GPS unit is not extremely difficult if you have basic wiring skills. Always follow the directions in your owner’s manual and make sure your installation will not void your warranty. Instructions can vary by manufacturer and model. Most instructions can also be found on-line if you do not have the original ones that came with your unit.
Use the proper voltage:
Use a multi-meter to check your voltages when you hard wire your system. Most GPS units run on 5 volts. Do not power a 5 volt unit from a 12 volt source. You can purchase a DC to Dc converter that will step down 12 volts to the 5 volts you need. Your GPS unit will also need a constant power source, one that provides power even when the ignition is off. You will need your vehicle’s owner’s manual and a meter to make sure you use the correct wires.
Wiring tips:
Remote mount units require a few more installation steps than most in-dash units. If your GPS unit needs to be connected to your vehicle’s Speed Sensor wire make sure you use the correct wire. Do not use your tachometer wire, if you do your GPS unit will think your vehicle is in motion anytime the engine is running. You may also need to hook your system up to your vehicles back up light system. If you skip this step your GPS will not recognize when you are backing up. Your navigation module should be installed in an out of the way location. If it contains a gyroscope it must be mounted horizontally.
Antenna location:
Your GPS unit communicates through its antenna. The location of the antenna is very important for your system to work correctly. The antenna will work the best if it is mounted on the outside of your vehicle. Metal in your vehicle will interfere with the reception of your GPS unit. You should also not locate your antenna near a wired rear window defroster or near windows with metallic tint or solar reflective lining.
Additional tips:
Use a 5 amp in-line fuse to prevent damage to your GPS unit. Make sure that you have a solid ground connection. Never draw power for your GPS unit, or any aftermarket devices, from wires that are connected to any vehicle safety devices. All of your wiring should be connected securely and should not be exposed to tugging or crushing. Once your GPS installation is complete do not forget to calibrate it.
References:
http://www.gpsfleetsolutions.c om/install.php
