Sam,

if it is a NO relay and is testing short you may have found at least one bad part. however, to be sure that the relay is shorted, as opposed to another component in parallel, you will need to remove it from the PCB and confirm.

imran?

On Jul 31, 2020, at 4:44 PM, sam via groups.io <sam@...> wrote:

?

[Edited Message Follows]

So - not sure how reliable this test is as it's done on an installed component but, I've found that one of the relays appears to be closed, whereas the other is open. I'm relatively sure the diagram on these relays indicates "normally open" so.

Should I remove the relay that appears to be closed and is potentially faulty to test on its own, or would I be safe in assuming that is the problem?

And thanks for that Davy - learning loads here hah! Will move onto thyristors after the above methinks..