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That's a good idea. I asked my A&P if he could do that but he said it would be a lot of work. I will see if I can devise a way. Seems like it would be a good test.

(Thanks to Neal/Bob/Paul/Charles/Joe/Jan and everyone else for patiently continuing to help me troubleshoot this issue).

Charles>Perhaps it wasn't the failure, but the repair/replacement process ...

Thanks for your explanation about the radio grounding. It's obvious when one thinks about it.

I'm still struggling with this. I rechecked the capacitors and they measure 5.7 uF for the S1915 whic ...

I took some measurements of bus voltage using a Bluetooth oscilloscope called a Mooshimeter. Here are 3 graphs. I'm also including a fourth one which is picture of the voltage in my car cigar lighter ...

Jan,

I think at this point I would agree with you: the problem is most likely related to the voltage regulator, not to switches.

I have ascertained that the noise is entering through the wires, ...

Good point. It's not a big ticket item (thought $40 seems a lot for two switches) so I guess I ought to swap it out.

Neal,
thank you for that. I only just saw your post. It looks like the issue with the regulator has been sorted out. I'm guessing the master switch is fine too but I'll bypass it in a test just t ...

Charles/Joe,
thanks. I will do the antenna coax test, and, assuming it's not entering via the antenna, I'll do the test that Joe recommended by connecting the B-lead and the avionics bus.
On the ...

You're right Paul - that's a good idea. Problem is I Guest I would have to take time off work during weekdays (when the A&P is around) but I can't right now.

The old OV system has been removed ...

Ok things are even more complicated as I just noticed that the plane power regulator has internal over voltage protection and so the over voltage protection on the a/c must now be bypassed.

I get ...

Thank you for your inputs.
I'm sorry it's a little difficult for me to know exactly what is going on as I am receiving reports from the A&P, not working on the plane directly (as I a not allowed ...

Hi Jan
No it isn't. The old one is a Ford. The new one a Plane Power regulator.
Can you explain why you're asking?
Sacha

Thanks. There is already an inductive and a capacitive noise filter on the 182.

What I'm thinking of though is: two weeks ago (before the ALT breaker popped in flight) everything was fine. So t ...

Hi Joe,
thanks for that suggestion. I now know that the noise comes from the Alternator and not the Mags. I have a specific question:
Regarding the ground connections my A&P did the following ...

Hi Folks,
it's been a while since I've posted - it's nice to be back. I am the maintenance officer of a flying club which recently purchased a 1972 Cessna 182P and I've recently been quite busy... ...