(Edited 06 August 2010 - 05:36 AM):
If you are having trouble with your relays. Some of the problems could be due to a faulty contact in the base.
The attached drawing shows how to remove the connectors from the base so they can be inspected or tightened by pinching with a pair of pliers.
If you need to replace them the brass connectors are standard items that can be purchased at any good automotive supply store.
I highly recommend dipping your relay pins in vaseline, this will help pre