investigating DC voltmeter - Positions for rectifiers are shifted, APU generator voltage can't be displayed

[K-dot-B]

After my previous report on the DC voltmeter I kept on experimenting with the electrical system, and I found another problem.

Issue: the last few positions on the voltmeter source selector appear to be shifted once clockwise (they show the voltage of the system marked to their left), and because of this the APU generator voltage can't be displayed.

Someone already mentioned this problem before, but it appears to be in the wrong thread and I don't think it was ever reported: 
https://forum.dcs.world/topic/323016-ac-voltmeter-wrong-wiring/?do=findComment&comment=5171138
so I decided to make another thread with some fresh tracks.

Track 1:
The first track demonstrates going over the affected DC voltmeter selector positions and verifying the sources for each one.
According to the CWAM Mi-24 manual, Rectifier Buses 1 and 2 automatically receive power from either rectifier, or through the guarded battery tie-switch from the batteries, APU or external power. I used this information for the test.

• Rectifier Bus 2: Shows voltage if either rectifier or the battery tie-switch is turned on. This behaviour corresponds to a rectifier bus. I suspect this position actually shows the voltage of Rectifier Bus 1.
• Rectifier Left: Shows voltage if either rectifier or the battery tie-switch is turned on. This is not the expected behaviour from a testpoint measuring a specific power source, so I think this is showing the Rectifier Bus 2 voltage.
• Rectifier Right: Shows voltage only if Rectifier Left is enabled.
• APU generator power: Shows voltage only if Rectifier Right is enabled.

The last two cases seem to confirm the theory that the switch positions and the actual values are shifted once clockwise. This picture demonstrates the actual values observable at each position:

 

Track 2:
The "APU generator" position does not show the voltage from the APU. (Track 1 demonstrates that it actually shows the value from Rectifier Right)

Lastly, these issues are probably related to the one in my previous report:
https://forum.dcs.world/topic/349937-dc-voltmeter-incorrect-reading-for-rectifier-bus-i/

Mi_24_DCvoltmeter_shift_issue.trk Mi_24_DCvoltmeter_noAPUvoltage_issue.trk

[f-18hornet]

Thank you, reported for internal analysis.

[JetCat]

I love with how much attention to detail you guys all care for these wonderful DCS planes

[K-dot-B]

20 hours ago, JetCat said:

I love with how much attention to detail you guys all care for these wonderful DCS planes

You know, I paid for the whole aircraft... 

This is why I like DCS, and especially the Mi-24. It's possible to go full nerd on a voltmeter, learn interesting things about the real helicopter and have fun flipping all the switches.

[gulredrel]

*bump* still a thing, I guess?

At least I wanted to see APU Gen voltage, but never got any indication when DC voltmeter is set to this position.

20240821_Mi-24_APU_Gen_DC_voltmeter_no_voltage_indication.trk