Is this an over-voltage device?

[Larry E]

I'm hoping someone might be able to identify what this unit is:

Whats_this.jpeg

The main positive output wire from the alternator goes to the left side terminal; and the right terminal wire then goes to the ammeter and main bus.
There is no identification on it - anywhere!
The aircraft came to Canada in 1974 and we don't have the American logs. There's no mention in the Canadian logs of the change from a generator.
Perhaps someone who's been around these old Cessnas for many years might remember seeing something like this.

Here is the voltage regulator;

Voltage regulator.jpeg

If it is an over-voltage device, does anyone know how they work?

Thanks in advance,
Larry

[n2582d]

Larry,

That's a Radio Frequency Interference (RFI) filter. Here's one from Aircraft Spruce.

[c170b53]

A quick glance, I would say thats a noise suppressor, removing any noise on the line.

[c170b53]

Now I’m looking at the hole in my cowboy hat like Timothy Blake Nelson, in The Ballad of Buster Scruggs. You got the draw on me Gary!

[Larry E]

Gary and Jim
Thank youse!
I've not seen these before - are they needed? Or is it possible they were used as a band-aid to cover poor grounds, unshielded plugs and harness's or unwise cable routing, etc.?
There are also 2 magneto filters installed - one on each P-lead exiting the mags.
I'm wondering if all this was done in the 1960's, and perhaps not needed with modern avionics??
Larry

[c170b53]

I rewired and installed one in my power feed years ago. Might be overkill or cheap insurance, I guess its up to the beholder.