What are you all running for this? I have a 5 MF on my generator. I have seen them on the voltage regulator side also. Both? What rating? I am getting noise with rpm on mine.
I also have a 3 MF on the ignition coil.

 

Sometimes it can be the filter cap in the radio also.

 

Well what vehicle do you have?

Mine is a 1971 Cutlas Supreme with the original charging system and I have no issues.

 

You can use a mix 31 RF choke to suppress generator noise. I recommend buying them from a specialty supplier over Amazon.

https://www.dxengineering.com/search...eering-ferrite

 

Or, try a new battery as it is the primary noise filter in the electrical system. What "noise" are you referring to? A whine is the generator, and a ticking is ignition. Condenser on the ignition good?

 

I use one of these that I got for cheap off Ebay awhile back. Works impeccably.

 

It's basically a fuzz like it's not tuned properly. It's fine at idle, then increases after about 1000 rpm. I am beginning to think its the antenna splitter I installed for a retro radio am transmitter I installed. The factory end of the antenna is not perfect either. May need to re-terminate that and add some shielding. I will report back.

 

I had a similar problem that turned out to be the factory antenna connection. I pulled the antenna and coated it with copper anti-seize (same as what I use on spark plugs). Problem solved (in my case).

 

I finally isolated the issue to the 12V power source for my Retro Radio AM Transmitter. I am using the bottom accessory slot with a male blade. I secured that a bit better for a noticeable improvement, but I am going to add a capacitor across the power supply for that unit. It wasn't the factory antenna or a ground.

 

I don't think that will work. A capacitor needs to go between the power source and ground, not inline. The capacitor will block DC but will allow AC signals (noise) to pass. It's put from power to ground in order to shunt noise to ground.

 

Thank you, yes across the power feed.

 

Going with an LC Filter per the Mfr. recommendation.

 

Let us know how it sounds after the install.