Jean,
Are you going to rewire the motor, the connector block, just replace the cords, or all of them?
The motor has red and black wires inside, I matched that when I did mine.
The connector block is color coded. Basically just match the new to the old.
The cord sets are already wired, just attach the controller, it's not polarized.
Here is two places to read:
{
http://www.quiltingboard.com/vintage...r-t205360.html }
{
http://vssmb.blogspot.com/search/label/rewiring }
Sometimes the side of the wire with the printing is the + side. Sometimes the wire has ribs on it as well. It drives me crazy trying to figure it out cos there seems to be no hard and fast rule of which method of marking means what.
Joe