I mean, hey, I'm not trying to offend anyone here. I'm only trying to help. When Mike says he bench tested the motor for hours, and did a great job on the motor rebuild, I believe him 100%. What I don't like is his attitude, that he so easily dismissed me and others with a response of 'I did everything right,' when - while I'm sure he did his part correctly - he did not, in fact, do 'everything.' Helping Nick to install the motor over the phone doesn't count as being there in person and doing it himself, putting hands on it, feeling the work, the torque of the screws, the tightness of the connectors, and seeing the shape of how it all fits together. I'm sorry, it just doesn't count.
Now say whatever you want about me, and I don't know about you, but I personally don't like being told that I'm wrong because of something completely unrelated to WHY I'm wrong.
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Moving on, Nick, I'm only now able to watch the youtube video, because I've been out of the country for the past two weeks. Looking at the wiring, you initially asked if it was wrong. First question, is it a two speed motor? Second question, why does it look like there's an extra blade connector around the other side from where the two wires are connected?
At this point I'm going to say with 99% certainty that you've connected one of the wires (looks like yellow) DIRECTLY to one of the brush's connectors. On a series wired motor (like most vacs) the motor is wired thusly:
Line -> 1st field coil -> brush -> armature coils -> brush -> 2nd field coil -> Neutral
From what I'm seeing, you've bypassed one (more accurately one-half) of the field coils. Like so:
Line -> brush -> armature coils -> brush -> 2nd field coil -> Neutral
What this would do is greatly reduce the overall resistance of the motor, causing it to draw a lot more juice, and arc a lot (though there are more complicated reasons why it would arc). In theory the motor would still run in this case, with only one field coil working, but I've never attempted such a thing myself.
I'm betting now that the yellow wire should be connected to that other terminal on the motor, it would be the unconnected blade on the 'top' (looking at it from the video). Ensure that the yellow wire is NOT connected to the little woven string-like copper wire that is coming out of the carbon brush. If it is, move the yellow wire to that other blade connector. And give it a go.
I'm anxiously awaiting your reply.