The International Cessna 170 Association

I'm hoping someone might be able to identify what this unit is:
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;
If it is an over-voltage device, does anyone know how they work?

Thanks in advance,
Larry

Larry,

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

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

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!

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

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