How to Hard-Wire a GPS to a Car


A mobile global positioning system, or GPS, enables you to determine your location while you are driving. Instead of having an array of wires hanging from the dashboard, you can hard-wire the GPS to the car's battery, which will ensure the device is turned on and off when you start the engine and shut it off, respectively. In under two hours, you can eliminate all the unnecessary clutter and additional connections by hard-wiring your GPS.

Things You'll Need

  • GPS hard-wire cable
  • Set of wrenches
  • Electrical tape
  • Raise the hood and disconnect the car's positive and negative battery cables from the battery terminals with the appropriate size wrench.

  • Mount the GPS device, using the suction cups, to a place on your dashboard that ensures you may see its screen clearly. Be sure the GPS will not obstruct your field of vision while you are driving and that it is well within reach.

  • Plug in your GPS's hard-wire cable and route it along the edge of your dashboard, and down underneath it on the driver's side. Tuck the cable in between the edge of the dashboard and the car's inner frame to disguise it.

  • Locate an opening in the vehicle's firewall, which stands between the engine and the passenger compartment. Route the hard-wiring cable through the hole and to the battery. A firewall hole should be located somewhere behind the gas and brake pedals.

  • Attach the end of the hard wire cable to the positive(+) terminal on the battery, then reconnect the battery cables and tighten them with the wrench. The red cable will connect to the positive(+), and the black to the negative(-).

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  • Photo Credit gps image by AlcelVision from
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