I’m assuming that you know what the relay does and that it’s called a DPDT relay, so going from there to the moveable armature, when the relay is in it’s normal position, there should be enough pressure to make the armature contacts move just a little. The surface of the stationary and armature contacts should wipe just a little. When the relay is energized, the same thing should happen to the lower stationary contact and the armature contacts. The armature contacts are mounted on a flexible flat spring like piece of metal. That flex is what allows the contacts to wipe.
It is hard to see under the best of circumstances but in that case in a basement cabinet, it’s impossible. At least now you know there should be some flex in the armature contacts when operating.
Now to answer your questions, yes you can use an emery board, but the striking strip from a package of paper matches is better and just cleans the contacts, it does not really remove any metal from the contacts. The rest of the match book can be cut the long way into a strip about ½” wide and used to clean the surfaces of the armature and iron core where they meet when actuated. Before and after burnishing the contacts and the armature/iron core, use some canned air for cleaning dust from your keyboard to dust the entire relay.
If this does not solve the problem, replace the relays/switches. Maintenance is good and solves a lot of problems.
Hope this helps.
David
I reread your post and if the relay isn't pulling it replace the relay. If it pulls in, but does not make contact, try burnishing and cleaning.
Regarding replacement, contact Best Converter as suggested for good price and totally compatible ATS.
