No clue what else to check.

[Jamesdiba]

I have a 2007 Gulfstream Sun Voyager. Everything works great when the engine is running while hooked up to shore power. When I shut the engine off, it eventually drains the batteries even though I’m hooked up to your power. The converter is putting out the amperage supposed to With the engine off. All the breakers in fuses seem to be working properly. I don’t know if it’s connected when I start the motorhome. I get an ECU 128. Other than that, I would love some suggestions on what to check next. I appreciate your time.

 

[Chuck v]

James,

We need to know WHICH battery bank is of concern here. For my 2007 Tour Master Diesel coach, the coach (house) battery was charged by the converter when on shore power and also by the engine alternator when under way. The chassis battery bank was charged under way by the engine alternator, but not by the shore power...so I added a secondary float charger to do that as well since I lived in my coach and did not drive it often. My coach had a third bank for just the diesel generator and 110 volt inverter which charged from shore power also.

Your coach may be wired similar to the drawing below:

 

[Skohlman]

I have a 2007 Gulfstream Sun Voyager. Everything works great when the engine is running while hooked up to shore power. When I shut the engine off, it eventually drains the batteries even though I’m hooked up to your power. The converter is putting out the amperage supposed to With the engine off. All the breakers in fuses seem to be working properly. I don’t know if it’s connected when I start the motorhome. I get an ECU 128. Other than that, I would love some suggestions on what to check next. I appreciate your time.

I too own a 2007 GulfStream Tour Master with the 3rd "Chassis Batteries" there's a GFI breaker in AC panel by bed which can be tripped. Mine was bad but different story. Also there's a battery tender 3amp found in power reel bay in corner hidden this was bad also. But maybe bad on your end thinking. For the record replaced with a smart 10amp 12v battery tender, didn't feel the 3amp was enough to charge batteries and or keep 12v lights working.

 

[Skohlman]

James,

We need to know WHICH battery bank is of concern here. For my 2007 Tour Master Diesel coach, the coach (house) battery was charged by the converter when on shore power and also by the engine alternator when under way. The chassis battery bank was charged under way by the engine alternator, but not by the shore power...so I added a secondary float charger to do that as well since I lived in my coach and did not drive it often. My coach had a third bank for just the diesel generator and 110 volt inverter which charged from shore power also.

Your coach may be wired similar to the drawing below:
View attachment 1333279

Hello could you also post an AC diagram ?

 

[Chuck v]

OK,

the 50 amp shore power connector is circled in green... Ac breakers are shown in the two center rectangles -- power is selected by the transfer switch to come from either the generator or the shore power. AC wiring for 110 v inverter is not shown, and typically that unit does not power large loads like the air conditioners, the washer/dryer or the water heater...

The 60 amp power converter is what charges the house batteries when on shore power,

Note there is no provision shown here to charge the chassis/engine battery bank...

Chuck

 

[Skohlman]

I'm learning also, but question there's AC breakers which work from Shore power / Transfer switch and others which work from Inverter, correct?

Also in RV world what chargers batteries (awesome engine alternator and or generator alternator charge batteries. And when shore'd power the converter does this?

Steve