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

Posted by HH56 On 2011/2/18 20:28:42

Don't give up yet. If you haven't discovered anything obvious, it would help to do a continuity check & make sure each field coil is good. It looks as if they sat in whatever got in there and do look a little sad. Also, there is a little copper strip on the bottom of that fiber board from one of the brush terminals to make contact with the case for ground. If no luck finding a problem there, then I would do a check in sequence to isolate the problem.

Place one meter lead on the terminal where one brush attaches to the two coil leads. With the meter on ohms, use the other probe to touch the metal support and make sure a coil isn't shorted. If good there, then connect to each of the harness wire leads in turn. Each should read a short there since there is no resistance to speak of in those coils.

If those are both good, then put the armature in so it makes good contact with the brushes. With the meter still connected to the coil and brush terminal, check for a shorted armature winding by touching the probe to the steel in armature--both the shaft and the outer part. If good, then connect the other meter lead to the other brush and check continuity as the armature is rotated in the brushes. If that checks OK, then reassemble and put one lead on the case ground. Connect the other lead to harness wire(s) to make sure that little copper piece is making a good internal ground connection when assembled.