Protecting horn switch contacts against arcing damage

Do you have a question? Post it now! No Registration Necessary

Translate This Thread From English to

Threaded View

Well it's half on topic....horn switch contacts in a 24V vehicle.

The contacts seem to have lost whatever protective plating they had. If I
clean them up they work well for a week or so and then oxidise up and become

Any suggestions on some sort of protective gel I can apply. I've the usual
contact cleaners etc but nothing for protecting contacts switching a
reasonably large current.


Re: Protecting horn switch contacts against arcing damage

Quoted text here. Click to load it

If you are concerened about them arcing, (which is then pitting,
burning and damaging the contacts) try a 1-2UF poly capacitor across
the contacts.

IF they are switching a logic circuit, or something that draws
virtually no current (not enough to "burn" through any crap that
accumulates), you could try adding a 1k resistor across the load.  (ie
- if the contacts switch the load to earth, then add the resistor
between the contact that doesn't go to earth, and 24v supply.

Site Timeline