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Thanks Charlie, I will check out those wires. I don’t think I have fuses in them but will check all the connections. It’s possible I could have damaged one of the connections at the shunt when I w ...

That’s ok Bob, I wanted to replace the battery anyway. I do appreciate your analysis.
I took some video yesterday, still with the old battery.

https://youtu.be/1TluvrVBLJo?si=IkUwgLP910Cht7Kt

I ordered a new battery. I figured it’s time to replace it anyway and maybe if battery internal resistance is the cause of the fluctuations I’m seeing, that will clear it up.

Thanks Bob,
Well, I did note several .1 volt fluctuations as displayed on the Dynon…

So I installed the new PP alternator and test flew it yesterday.
The alternator load seems to fluctuate more than I remember with the old one. For example with all avionics and external lights on, ...

My alternator failed just in time!!!
I thought $1,000 was crazy but they just jacked the price up to $1,500!
WTF?

Update: I finally had time to think about this again. I removed the alternator. It makes some scraping noises when rotated. I took it to a local guy who is reportedly very knowledgeable. He tested it ...

Thank you guys for the thoughtful and helpful replies!
The dynon is a D-180 which has all my flight instruments and engine indications on one screen. I have to change pages to see the volts and amps, ...

That would be interesting and probably helpful, but I don’t believe the dynon was set up to record data. I’m not a computer guy. It’s an old d180 and I have never done firmware upgrades or playe ...

Holy cow, my alternator failed (I think) today. I thought “no big deal, I’ll just throw a new one in” but wow, the price has tripled!
I better make sure that is the problem before I spend $100 ...

Thanks Bob,
I may end up doing that if I can't find something obvious. Good suggestion.

Jeff,
Thanks for the reply. I had wondered about overheating and asked the avionics shop that question. The guy said it shouldn't be an issue with that transponder. I have put my hand under the panel ...

I've had a garmin transponder in my plane for the last 5 years. I bought it new. I think it's a GTX 327. For the past couple years it will randomly power off and back on. When it does this it is usual ...