Where does the Mercruiser DTS system gets it power from?

[pcmpete]

I have checked my Clean Power cable from the battery to the engine.
Both read 14.52volts at idle.
My alternators go thru an isolator and the output is 13.8volts
But my Vessel View only shows 13.1volts (and never gets any higher)
That is a difference of 1.4volts from the battery and 0.7volts from the Isolator.

So my question is, where does the power for the DTS and Vessel View come from?
Where should check next?

Thanks

 

[tank1949]

I have checked my Clean Power cable from the battery to the engine.
Both read 14.52volts at idle.
My alternators go thru an isolator and the output is 13.8volts
But my Vessel View only shows 13.1volts (and never gets any higher)
That is a difference of 1.4volts from the battery and 0.7volts from the Isolator.

So my question is, where does the power for the DTS and Vessel View come from?
Where should check next?

Thanks

Not real sure about DTS. 13.8 sounds good! but I believe lots of resistance in wire going to your helm gauge. I am guessing 15-20' span? I've seen corrosion cause voltage drop too. Most of the gauge wiring is small gauge and may not be tinned or marine. I am having headaches too. Run test wire (14 gauge or better to helm gauge (relocated) back near motor and record differences) Good luck!

 

[achris]

The DTS is a canbus system, and as such the power is part of the NMEA2000 system protocols. The bus derives power from within the ECU. The voltage readings you're getting are from sensors inside the ECU, and as such are subject to voltage drops between the battery and the sense point. These include (but not limited to) battery terminals, connections between the starter motor solenoid and the main harness, fuses and the connectors onto the ECU. To see a difference of 1 or so voltage between battery posts and sense point inside an ECU is not unusual.