These are tutorials on specific aspects of sewing machine repair that I’ve found helpful in my work on old machines. More to come soon!
Electric, Wiring, Motors.
Electrical systems and safety from The Archaic and the Arcane: http://www.archaicarcane.com/love-becomes-electric-electrical-safety-and-your-sewing-machine/
The Vintage Singer Sewing Machine Blog on how to rewire a potted motor (info very applicable to other types as well): http://vssmb.blogspot.com/2012/01/complete-how-to-re-wire-potted-motor.html
Wiring diagram for vintage Featherweight style Singer plugs: http://oldsingersewingmachineblog.com/2012/03/28/wiring-diagram-for-vintage-singers/
ISMACS Singer wiring diagram: http://ismacs.net/singer_sewing_machine_company/manuals/sewing-machine-wiring-diagrams.pdf