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LOW VOLTS indication when radio transmit

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c17testplt View Drop Down
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    Posted: 26 Dec 2020 at 9:14pm
fan and IFD are wired through avionics master switch.  You think the voltage going through switch is different than the main bus?  I also have a com 2 (KLX-135A com gps) on the same switch, and when I transmit on Com 2 the IFD540 stays solid
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Post Options Post Options   Thanks (0) Thanks(0)   Quote scotthess Quote  Post ReplyReply Direct Link To This Post Posted: 26 Dec 2020 at 8:11pm
Is the fan on the avionics bus?
Is the MVP wired to the main bus?
If yes and yes I would start with the avionics switch and/or CB.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote c17testplt Quote  Post ReplyReply Direct Link To This Post Posted: 26 Dec 2020 at 5:15pm
So I am trying to figure out why when I make longer radio transmissions (2-3 seconds) My IFD 540 goes into low volts mode.  My MVP-50 engine analyzer shows 13.2-13.6 volts constant, and the the ammeter drops from +1.2 to +.2 to sometimes -.2.  I have a new alternator on  my recently overhauled engine,  I tried to figure out the voltage logs from the IFD and can't seem to make sense of them or what might be going on.  I have a new battery contactor with a fairly good battery.  What is the IFD using to trigger this mode?  Where should I be looking to figure this out?  I notice my cyclone fan changes pitch when I transmit, but the MVP is not showing the same big draw on the power than then drop of about 1.5 AMP
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