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Alex -
The diagrams on the side of the relay can be very helpful. Relays have generally the same contents, here's a quick layout:
First there is a magnetic coil. The terminals for that are usually #85 and #86. Look at one of the diagrams and find that.
Next there is a piece moved by the magnetic field, it's called the armature. It has a connection to it, #30, and is shown as connected to the pivot point.
The #30 can connect to one contact if the relay is open, and another when the relay is closed. Not all relays have the N.O. contact, those will have only four terminals on the base. The central locking system uses two of the five-terminal type relays.
When there is no magnetic field, the armature is in open position, and sometimes there is a contact there, #87a. That's so that if the relay is not acutated, current can flow from #30 to #87a. This is the N.O. (normally open) contact.
The contact that gets current when the relay is actuated is #87. It is called the NC (normally closed) contact.
Variations from the "Plain Vanilla" relay come in with circuit boards for toggling (o/d relay) and time delay (a/c relay) and some others mods. But basically you can tell a lot from looking at the diagrams on the side.
Your 240 has a wiper delay on the rear window, right? One of your mystery relays might be that.
Sometimes the only way to identify a relay is by the colors of the wires to it, in addition to its location. What terminal number gets what color wire?
Good Luck,
Bob
:>)
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