Owner`s manual

MST660 Owner’s Manual Page 9
Referring to the wiring diagram:
1. Connect the Red wire labelled ‘BATTERY B+’ directly to the positive
terminal of the vessel’s battery, or to a point which has +12 Volts available
at all times. This lead maintains the memories within the MST660 and is
the main power source for the unit.
2. Connect the Orange wire labelled ‘POWER B+’ to the vessel’s +12V
supply via an appropriate isolating switch or circuit breaker. This lead turns
the radio ON and OFF. Alternatively, this wire can be connected directly to
the battery’s positive terminal and the MST660 switched ON and OFF
using it’s own controls.
3. Connect the Black lead labelled ‘GROUND’ to the battery’s negative
terminal or to the common negative bus in the electrical system.
Important: Your MST660 is able to maintain it’s memories when it is switched
off by drawing power directly from your battery via the Red ‘BATTERY B+’
lead. Although the memory backup current is very small (about 4 mA) it may
eventually discharge your battery if left connected indefinitely. The time taken
to completely discharge your battery could vary depending on it’s Amp-hour
rating and condition.
If you do not run your boat’s motor regularly or your battery is not kept
charged between outings (e.g. Solar or wind charger), we recommend you
disconnect the Red lead each time you secure your boat. This is easily done
by connecting the Red ‘Battery B+’ lead via a Master switch which can be
switched off after each outing.
MST660
ORANGE
GND
Antenna
10 AMP
Optional Master Switch
External Aux. Switch (Optional)
Power B+
Battery B+
RED
BLACK
1 AMP
MST660 I.M.-2 21/12/99 1:26 PM Page 11