Victors behaving erratically when PWM is plugged in

[Joe Ross]

Originally Posted by Sylphrena

UPDATE: We replaced the y-cables with straight cables, and the problems disappeared. Now we're rapidly running out of space on the sidecar for more victors, but that's neither here nor there.

I suspect that the root cause of the problem is the digital sidecar power, as others have suggested. By adding more motor controllers, you are increasing the amount of leakage current coming from the DB-37 cable which is making it work temporarily. If you remove the DB-37 cable, are all 3 LEDs brightly lit?

I would encourage you to not consider the problem solved until you can run with Y-cables.