The Aux Ringer contacts are connected to a Bogen amp Nite Ringer connection. This has been working for years. Programmed for Night Service, Line 1 and 2 will ring over page horns.

The night ring thru page horns quite working. Testing shows two problems: 1-Aux Ring contacts don't show any short during ringing, as tested with continuity tester. 2-Shorting the Night Ring contacts manually on the amp does not produce any ring over page.

I changed the amp, and shorting the Night Ring contacts now makes sound over the horns. I recall that this same site had the same problem with the contact closure at the ksu on an earlier system years ago.

I've never had the contact closure be a problem anywhere else. Has anyone? Is there any fix for it? What would cause the ksu contacts and amp's night ringing to fail at the same time?

Thanks.
Jim