Operation Manual

60 RS25 Operation and Installation Manual

7-8 Connect the Radio Cables

The connectors are on the rear of the base unit, as follows:

1. GPS and COM connector. For connection to GPS device via NMEA. Also includes NavBus wiring

for Track Buddy and other features. See the following table for wiring and color codes. (If you’re not

using this, be sure to put the protective cap securely over the connector to protect it from moisture

and dust.)

2. External Speaker connector. Plug the external speaker cable jack into the connector BEFORE

powering on the radio. Use a 4 Ohm 4 Watt external speaker.

3. RED Power wire. Connect this to the POSITIVE (+) battery terminal. Check that a 10 Amp fuse is

installed on this power cable close to the battery.

4. BLACK Power wire. Connect this to the NEGATIVE (-) battery terminal.

5. ANT. A radio antenna is not supplied. A suitable radio antenna must be mounted and connected

before operating the RS25 radio. Consult your dealer for advice if necessary.

6. GND. A ground connection is not usually required..

7-9 Set Up the Radio