MSFS20 Radios only work with autostart.

[Mathias]

Hey guys,
obviously I'm missing something very basic.
I working on a vintage aircraft with a very simple electrical setup.
Position lights are on the alternator bus, and since this aircraft was retrofitted with com radio and Transponder it has the radios hooked up straight to a battery.
No other consuments available in this machine.
Problem is, the radios only work when I autostart the engines. They don't when starting cold and dark
Obviously FS flips a switch during autostart that I have no idea what it should be.
Any idea what I'm missing?

My electrical setup:

[ELECTRICAL]
bus.1 = Name:Main_Bus
bus.2 = Name:Battery_Bus
battery.1 = Connections:bus.2#Capacity:24#Voltage:curve.1#Name:MAIN_BATTERY ; Main Battery
alternator.1 = Connections:bus.1#IEng:1#RatedVoltage:6#Load:curve.2
curve.1 = 0:10.5,0.1:11.5,0.5:12,0.9:12.2,1:12.2
curve.2 = 500:0,1200:30,1400:55,2800:60
circuit.1 = Type:CIRCUIT_GENERAL_PANEL#Connections:bus.2#Power:0.5,1,10#Name:General_Panel
circuit.2 = Type:CIRCUIT_LIGHT_NAV#Connections:bus.1#Power:10,15,6#Name:Nav_Light_1 ; nav 1 light 15W
circuit.3 = Type:CIRCUIT_AVIONICS #Connections:bus.2 #Power:20,25,10.0 #Name:Avionics_1 ; avionics 1
circuit.4 = Type:CIRCUIT_AUDIO #Connections:bus.2 #Power:10, 15, 10.0 #Name:Audio ; Audio 15W
circuit.5 = Type:CIRCUIT_XPNDR #Connections:bus.2 #Power:10, 18, 10.0 #Name:Transponder ; Transponder 18W
;circuit.6 = Type:CIRCUIT_NAV:1 #Connections:bus.2 #Power:4, 5, 10.0 #Name:NAV1 ; NAV 1 5W
circuit.6 = Type:CIRCUIT_COM:1 #Connections:bus.2 #Power:4, 5, 10.0 #Name:COM1 ; COM 1 5W
circuit.7 = Type:CIRCUIT_XML:1 #Connections:bus.2 #Power:10, 15, 10.0 #Name:AS92

...and what Simvarwatcher tells me while going through the manual startup procedure.
Note, after autostart both circuits avionics and comm1 are working.

 

[=rk=]

Have you any component xml?

 

[Mathias]

Not sure really.
It's a 100% hack of the stock Asobo AS92/AS21 templates off the Savage Cub.
My Interior.xml has these entries here:

        <Include ModelBehaviorFile="Asobo\NAVCOM\AS92.xml"/>
        <Include ModelBehaviorFile="Asobo\Transponder\AS21.xml"/>





        <!-- GLASS_COCKPIT ############################ -->
        <Component ID="GLASS_COCKPIT">
            <UseTemplate Name="ASOBO_AS92_Template"/>
            <UseTemplate Name="ASOBO_AS21_Template"/>
            <CameraTitle>Instruments01</CameraTitle>
        </Component>

That's all you can find in the Savage cup so I'd think the subtemplates will be called from the AS92/21 templates.

 

[=rk=]

alternator.1 = Connections:bus.1#IEng:1#RatedVoltage:6#Load:curve.2

Try
alternator.1 = Connections:bus.1#IEng:1#RatedVoltage:28#Load:curve.2

 

[Mathias]

Thanks, but the radios are not on the alternator bus, only on the battery bus... and that poor little aircraft only has a 6V alternator.
As I said, only the nav lights are on the alternator bus.
And again, the radios do work as expected when I CTRL+E the engines.

 

[=rk=]

Yes well actually the way you have it, everything that drains is on the battery bus and the alternator is on it's own bus essentially pumping out 6 volts and there is nothing even drawing on it, maybe spark plugs. There is no charging on the battery bus and if you used the electrical system debug window it would probably confirm that.

My aircraft has two busses, actually 3 with the spare battery but each main bus has both battery and alternator. When I test my aircraft electrics, ctl e will start it when my programmed manual start sequence will not, therefore it will start it when it is essentially "impossible" to do so otherwise so I don't use it to test anything so sophisticated as a manual start sequence.

 

[Mathias]

It was dead simple acually as suspected in my initial post.
I had to add a battery switch and all is working as intended. now.
Thanks for your suggestion, esspecially for bringing back the debug window to my attention!

Edit: The avionics circuit was in need of a switch, too.