Re: 51Packard's....51 Packard

Posted by HH56 On 2011/2/20 17:25:40

You may be getting some feedback thru the other brush and armature because I tried to be brief again, skipped something and didn't have you isolate the armature for the first check. I had you put the armature back in the third paragraph but never had you take it out in the first place. Forget not everyone does this daily and didn't mention one of the important steps. My apologies.

Put a piece of paper between the brushes and armature or pull them away first. Now with the meter on ohms, and the probe connected at blue dot, you should not see any movement (infinity or open) anywhere except the two leads at the end of the harness cable. At the two wires, there should be 0-1 ohm or essentially a direct short.

After that, keep the paper there so the brushes don't connect but touch the commutator with one probe and the steel on the armature with the other. Do as O_D mentions and check each segment of the commutator to armature steel. The meter should not move ie no connection or infinity. Then do segment to adjacent segment. There will be some tied together and I don't know the spacing. Opposite sides where each brush would connect, yes but I don't think next to each other. If there is an adjacent connection, have to work out the overlap path and that would need a motor person. Do opposite each other next and there should be a short or very low reading. Rotate the armature and check the next pair, rotate and the next etc etc. If all good, then remove the paper and do the rest of the checks.

Connect everything up, one lead to ground the other lead to each of the harness wires individually. You should have a short or very low ohms. Rotate the armature and you should have no or very minimal flicker of meter movement -- it should stay shorted. If all those check good, then there is continuity, no shorts and the motor should run. If not then it's time for an electrical person for expertise .