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It is a known problem that poor contact is made on some NEW seep point motors.Perhaps some electrical contact cleaner might work.Move the actuating rod back & forth quickly 20 or 30 times & see if that cleans the contacts for you also make sure that under the brass contact washer is good & clean.I presume that you tested these motors before you fitted them to your layout. I would always advise this even when the motors are new.
