LOW VOLTS indication when radio transmit |
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c17testplt
Newbie Joined: 03 Oct 2017 Location: KVPC Status: Offline Points: 4 |
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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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scotthess
Newbie Joined: 30 Dec 2018 Location: Texas Status: Offline Points: 28 |
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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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c17testplt
Newbie Joined: 03 Oct 2017 Location: KVPC Status: Offline Points: 4 |
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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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