
RST973 IN-VEHICLE INSTALLATION & USER MANUAL
23
Connecting Power to the Interface unit
Caution: Failure to follow these steps may cause the accessory not to work properly
and may cause damage to the phone.
Warning:
Do not connect the terminal to the Battery Supply
until the installation is complete.
1. Ensure the power and Interface cable to the Interface Unit will reach from the
RST978 unit to the point at which vehicle power is being sourced DO NOT
connect to the interface box until after the installation is complete.
2. Route the power cable from the RST973 Interface unit to the connection point.
3. Note: To limit ground loops and high impedance ground paths, run the
green/red-stripe and black wires directly to the battery, or as close as possible
to the battery. Use a grommet or other protection to prevent wear on metal
surfaces for these wires.
4. Prepare the fuse block. Remove all fuses, and tape them to their respective
holders, before making any connection. DO NOT insert fuses until you have
completed and inspected all connections.
5. Connect the
BLACK
Ground wire to negative battery / vehicle chassis (if
negatively grounded chassis).
6. Connect the
RED
+Batt wire to the v Battery (+12V) via a 3A fuse.
7. Connect the
GREEN
Accessory wire to the vehicle accessory power, via a 1A
fuse. (This may be connected to Vehicle Ignition voltage if Accessory power is
unavailable).
Caution:
DO NOT
replace any fuse with a higher amperage fuse.