C45YV Dynamo repair

[David Edgar]

I have traced my TC dynamo problem to a short to ground in the field windings. I had rebuilt the dynamo many, many years ago and vaguely remember some insulation issues back then but possibly the issue has risen again. At any rate, in looking at how to disassemble the dynamo I see where I had soldered one field winding lead to the F terminal inside. I again vaguely remember doing that as that is the way I had found it upon dis-assembly. It was a real bear to unsolder and then solder back in place then. This time before I go through the hassle I am wondering if that is the proper method of connection. All the other leads inside are attached with screw terminals to make dis-assembly and reassembly easy. Can anyone verify if the original field winding lead attaches directly to the F terminal via soldering or if there is a mechanical connection (screw terminal or ?) to make it more convenient?

[Gene Gillam]

David,

Mine is soldered...

Gene

[David Edgar]

Well I finally traced my dynamo field winding short to ground. Each of the two field windings wrap around iron cores and there are little tabs on the core to retain the windings. Over many years, one of the tabs wore through the insulation wrapping and shorted out the coils. What I will attempt is to coat the areas around where the tabs are with some polyurethane insulator goop that I kept when I rewound a pool pump motor 30 years ago. In that case I wound the motor and then brushed this stuff on and let it ooze into the windings to hold them in place on the spinning armature. I may put a piece of wire insulator in the depressed area as extra precaution and let the poly stuff hold it in place. I will take more photos at that stage