StreetPilot 7200/7500 Owner’s Manual 51APPENDIXDR Cable WiringThe Dead Reckoning (DR) cable is used by the 7500to provide dead reckoning, which allows the 7500 tocontinue to get navigation guidance even if it loses GPSreception. The DR cable is also needed for both the 7200and 7500 to use a backup camera. The DR cable must beinstalled to the Reverse Light Switch. For informationabout configuring the backup camera, see page 34.The Dead Reckoning (DR) cable connections must beinstalled by a Garmin-authorized, licensed installer.WARNING: The terms of the Garmin Warrantyrequire that the DR cable be installed by Garmin-authorized, licensed installers.Connecting the DR Cable to the Vehicle1. Connect the orange DR 1 wire to the VehicleSpeed Sensor Signal. Do not connect to thevehicle speed sensor signal from the ABScontrol. (Note: For backup camera, you onlyneed to connect DR 2.)2. Connect the green DR 2 wire to the ReverseLight Switch.Connecting the DR Cable to the 75001. Open the weather cap on the 12-Volt plug toaccess the DR connector.2. Plug the end of the DR cable into the connector.Push the plug in until it is fully seated.DR 2 - green to Reverse Light SwitchDR 1 DR 2DR 1 - orange to Vehicle Speed Sensor Signal Do not cut or splice the cablebetween the limiter and plug.If you need to cut or splice thecable, cut or splice past limiter.