6.1 Head Unit¶
Marine-grade entertainment system with multi-zone audio, Bluetooth, and NMEA 2000 integration.
Type: Marine Entertainment System
Model: MS-RA670
Manufacturer: Fusion (Garmin)
Product Page: Fusion MS-RA670
Manual: Installation Manual
Mounting: Dashboard center console (factory radio location)
Power Source: BODY PDU CB30 (15A CONSTANT) + ignition sense from bus bar
Specifications¶
| Spec | Value |
|---|---|
| Display | 2.7" full-color TFT |
| Speaker Output | 4x 50W RMS (not used) |
| Max Current | 15A |
| Waterproof | IPX7 |
Features¶
- AM/FM radio with RDS
- Bluetooth audio streaming and hands-free calling
- Multi-zone audio (3 zones + subwoofer)
- DSP with presets
- NMEA 2000 integration
- PartyBus networking
- USB audio playback
RCA Pre-Outs¶
| Output | Destination | Amplifier |
|---|---|---|
| Zone 1 L+R | Front dash speakers | Ch 3+4 |
| Zone 2 L+R | Rear roll bar speakers | Ch 5+6 |
| Zone 3 L+R | Available | — |
| Subwoofer | Subwoofer | Ch 1+2 bridged |
Wiring¶
| Connection | Wire | Source | Notes |
|---|---|---|---|
| Constant (Yellow) | 14 AWG | BODY PDU CB30 | Main power (15A, CONSTANT) |
| Switched (Red) | 18 AWG | Ignition SWITCHED bus | Ignition sense signal |
| Ground (Black) | 18 AWG | Dash ground | Same ground as MLC-RW |
| Antenna | Motorola | Factory antenna | Fender or windshield |
| Remote Out | 18 AWG | To amplifier | Turn-on signal |
Power Configuration¶
Head unit uses single BODY PDU circuit with ignition sense:
- CB30 (15A, CONSTANT): Yellow wire - main power (~15A max)
- Ignition sense (SWITCHED bus): Red wire - tells head unit when to turn on/off
Head unit has internal power management - draws full power when ignition sense is active, minimal standby current (~1A) when off for memory retention.
Outstanding Items¶
None - all specifications determined.