Paul K
Well Known Member
I'm having multiple voltage alarms and low voltage issues. This started with an occasional voltage alarm that would go away when acknowledged but more things began to happen recently. First, my set up:
Plane power 60amp self regulated alt
B&C SB-20 secondary alt
PC 680 battery, in use 3 yrs but about 5 yrs old.
8 amp hour battery on dual GRT HX system, new.
VPX pro
Garmin stack, 430W, SL30, 327 x-ponder, intercom
In flight, first low voltage on all three buses, then radio noise before "com service" warning on the 430, continuing to degrad everything on the panel. First coms and then 430 GPS will fail.
Going to VPX page on the GRT HX, see voltages in the very low 12 or high 11 range. Switch to SB 20 and no improvement. Consumption about 7 amps changing as I turn stuff on or off as expected. Individual items will shut down, such as ADSB, flaps, etc
Removed the main alt and had it tested, OK. Changed the PC680 battery, no difference. Checked every wire FWF and all connections, feeds, and diodes, check good.
Starts easy, dual p-mags
Not sure what to check next and hoping this has happened to to someone else who knows what is going on.
Plane power 60amp self regulated alt
B&C SB-20 secondary alt
PC 680 battery, in use 3 yrs but about 5 yrs old.
8 amp hour battery on dual GRT HX system, new.
VPX pro
Garmin stack, 430W, SL30, 327 x-ponder, intercom
In flight, first low voltage on all three buses, then radio noise before "com service" warning on the 430, continuing to degrad everything on the panel. First coms and then 430 GPS will fail.
Going to VPX page on the GRT HX, see voltages in the very low 12 or high 11 range. Switch to SB 20 and no improvement. Consumption about 7 amps changing as I turn stuff on or off as expected. Individual items will shut down, such as ADSB, flaps, etc
Removed the main alt and had it tested, OK. Changed the PC680 battery, no difference. Checked every wire FWF and all connections, feeds, and diodes, check good.
Starts easy, dual p-mags
Not sure what to check next and hoping this has happened to to someone else who knows what is going on.