FX-3 MAIN volts indication issue

[Cactus Charlie]

My FX-3 shows Volts-1 about 0.6 with IBBS on, Master off, and all breakers in. I have looked at the logs from several other FX-3 and they all show this anomaly but with some variation in the voltage.

This has bugged me for years but I recently took lots of measurements which I think indicate a voltage offset in the ground references provided to the GEA 24. I'm still looking through my measurement data and I have some ideas of what to test next.

One test case on my FX-3 was interesting and I'd like to know if other FX-3 (or EX-3) show the same anomaly -

IBBS On, Master Off - record and report Volts-1 (main bus) and BAT Amps
Pull GEA circuit breaker - record and report Volts-1 (main bus) and BAT Amps
Push GEA circuit breaker - record and report Volts-1 (main bus) and BAT Amps

 

[Neal]

There's been talk of parasitic drain when a FX-3 is in the hangar and why most have to leave it on a charger unless using an EarthX battery. I wonder if this is related and what may be that drain?

 

[Cactus Charlie]

The main battery on an FX-3 has three parasitic loads. My measurements show the currents taken by those loads are:

40 μA - GPS keep alive
115 μA - left ignition module
115 μA - right ignition module

I do not believe these parasitic loads are related to the anomaly in indicated Volts-1.