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That isn't bus voltage. It's the indicator circuit from the battery BMS. The Skyview has no idea what's going on with your battery...

Same thought. I've gone over and grounded every case directly to the airframe for just this reason, but no change. It's all just so odd...

Very helpful again, airguy! In the time history plot in post #3, you can see the low voltage flashed every 5 seconds exactly for 2.5...

That indicator is "grounded" to indicate a fault - so if you have a point where the insulation is rubbed through and it is shorting to...

If you don't find an obvious short to ground somewhere, the possibility exists that it is a legitimate alarm from the battery. Attached...

I had checked wiring before posting, with no fault found. Knock on wood, my problem seems to have self healed. We all know that...

I often witness testing of avionics in the lab environment for EMI and audio interference. Generally it is essential that the equipment...

If you don't find an obvious short to ground somewhere, the possibility exists that it is a legitimate alarm from the battery. Attached...

That indicator is "grounded" to indicate a fault - so if you have a point where the insulation is rubbed through and it is shorting to...

Thanks, airguy, very helpful! Yes, I have an EarthX battery and yes I have the fault indicator wire connected to the Skyview EMS-220...

Does the airplane have an EarthX battery in it? That battery has an internal fault indicator with an external wire that can go to the...

Aha, that link was very helpful. That sensor reports any voltage above 5V (up to 15V) as 5V, so it does appear I have a loose...

It was a harness from a well known supplier

Riseric, I’ll pm u a diagram of what i use - is easy to follow & uses the existing 15 pin dsub connector numbers so its a plug & play...