Relays shouldn't click unless they are switching on & off like blinker relays... but they shouldn't buzz...
that usually means the relay has had it... and its switching on & off all the time ?? or the points [contacts] inside have stuck together... [welded together] and need replacing...
a relay should be either On or Off...
they are just an electric switch....
I use them to save all that current going thru My old original VW switches...
Lee
http://community.webshots.com/user/vw68autobug
- Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY---