Humming Converter

There are many types of converters: ONE is a transformer based, In this a common transformer (2 windings around a common Iron core) convert 120vac to around 10 or 20 VAC (20 is Center tapped) and then by use of some electronics convert that to around 14VDC (NOTE, Low voltages are approximate).

The other type is a switching power supply,, they can hum too but not as likely.

The iron core of the transformer is not a solid hunk of iron, it is dozens of thin metal leaves that are coated with varnish and then sandwiched together.. Over time the varnish dries out and flakes away allowing the leaves to vibrate in step with the magnetic field the coils of wire create.. The result.. HUMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM.


That, at least is the theory.

The real reason it hums... It forgot the lyrics to one-note-samba. (it only humms one note after all). This is just a little samba, built upon a single note.

(Ok, Ok, this is what happens when an electroincs technician learns to sing.. Bad jokes).

Yet again, I thank you all for the advice. I'll look into the wiring then think about replacing the unit.......

PS, the battery is fine!

Did you check you house wiring to see if you have a ground neutral switched? Could also be the converter but before I changed that I would check the wiring first.

My son claims mine has a high pitched whine that drives him crazy. I don't hear it, I guess my older ears can't hear that range. I just accept it as something good about getting older.

Older converters used transformer based power supplies. New converters use electronic power supplies. The old transformers had strong magnetic fields that would resonate and hum. Sadly, often just before they failed (at least mine did that). They also are known for boiling the electrolyte in batteries from over-charging, so it's poor practice to leave them on for long periods of time, and you need to be vigilant about servicing your batteries. many just upgrade to a newer system.

Brian

How is your battery?

1992 vintage.......

YES humming is normal for that era of converter

Mine only does that when the fans kick in. This only happens when more than three lights are on. My in-laws have a similar trailer, theirs is the same as mine.