From what I have found ( not that much compared to some ) Singer foot controllers are rated at around 1.0 ± amp. I just picked up two 158- Series Kenmores that have 1.2 amp rated foot controllers. I'm going to have to replace the wiring on one due to rodents gnawing on the cords. But before I do that I'm gonna check my LSMG to see if he has a complete cord set up. If so I'll use the extra controller on one of the machines that the foot pedal gets hot just to see how much different it works.
Or maybe the Kenmores will answer the question themselves.
Joe