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Thanks Bell. That was my initial thought, regardless of the engine, it had to be tied to the airframe somehow. I'm attaching the two documents supplied. They seem to be specific to the motor but not the aircraft and even if it was there's about a zero percent chance there would be something tied...

That was always my plan to begin with. However the gov. shutdown has put a huge delay on that as *I think* my only option to upgrade is via field approval, and the FSDO is closed. Going through the motions of testing the system has been a good learning experience for me since this is my first...

Not yet, but when I get to the bottom of this, I plan to put together a flow chart of everything I did to help others in the future.

Thanks for the help guys. Forecast calls for rain the next couple days so I won't be able to test anything until it stops. Thanks for that link flyingbrit, very helpful.

Yea it was close. I guess that’s what I get for tinkering without fully knowing what I’m doing. I got the battery to field from a YouTube video on a similar voltage regulator but i guess the guy didn’t specify positive or negative ground. Definitely feel like an idiot.

Well I just tried to short the battery to the field (engine off) to see if that would help, got the spark but now the entire charging system doesn’t work, no movement In volts or amps when I rev up. Might be time to take it to an expert.

Okay, finally got around to this today. If I understand correctly, it appears like the voltage regulator is the culprit. At full load, and 2000RPM when I pushed the switch there was a tiny blip in the voltage and ammeter. However, when I took all the load off, at 2000RPM, the ammeter was only...

Thanks for the help guys. Hopefully I'll have something to report by the end of the weekend.

I'll give both methods a try, because it can't hurt to have more data. I've never messed with a belt system, any hints on getting the belt back on and tension correctly?

Very interesting, I wonder if it wasn't setup correctly and that's what's causing the problems with the generator. So your suggestion would be to pull off the generator and regulator and have them properly set by the shop before re-installation?

Thanks for the help Jim. I'll see if I can get this tested over the weekend and report back.

Found a part number, it was buried on the other side. Looks like it's an automotive one. A little confused as to whether it's the correct type or not?

I found a local classic auto electric shop that can take a look at it. I may have him bench test it and possible overhaul, just for the learning experience.

There are 3 controllers inside, photo attached. It’s a 20AMP. The data plate says 20AMP, as does the part number: Delco Remy 1101899. It’s also belt driven not gear. This happens during daytime VFR, the only thing running is the transponder and radio ~4-5A total.

I agree that the touch and go behavior makes sense, but I don’t agree that the cruise behavior does. If the battery is fully charged, and full generator output is available, why would the battery start to fail? The first thing that happens is the encoder shuts off and I lose my alitude report on...

I may give this a try, watched a few YouTube videos and it looks relatively easy. Does anyone think my generator just needs to be repolaraized? I did unplug the battery when I did some work on the transponder, I didn’t know the generator would need to be repolarized. Seems like the problem has...

I made it to the airport for a quick check this evening. I didn’t have a ton of time, but I went to the runup, turned everything on and ran it up to 2000-2200RPM. I held it there for a few minutes. It started out strong, in the mid-13s then started to slowly drop, within 5 min I was at 12.2V at...

I opened it up last night and it looked brand new inside. I will try to adjust it later this week when I make it back to the airport.

The description says it requires an external regulator. I'll have to see who I can convince to let me install that, as it says for experimental. I was looking at the BC-400-2 which is the full kit designed for the O-290-D. http://www.bandc.aero/alternatorbossmountforpa-1819stc-pma-1.aspx

Link? Google is failing me. I am based out of KSNA. I may have found someone today that can help me, but I'm always willing to take more recommendations if you know someone. I will read 21.303 tonight and see what I can find.