tn77 wrote:I'm not an electronics whiz... can someone explain to me exactly why this fix works? We all presume that the diode is bad. But why is the fix to INSERT a diode in this spot?
I'd like to learn a bit about this, thanks.
Darell explained this in his thread, but IIRC ...
a diode is often used as a one way valve for electricity, in the same way that valves exist for water that only let it flow in one direction. The presumption here is that the diode failed in the open position so that when the EVSE checks for the diode it finds current flow in the prohibited direction. Insertion of a new diode anywhere along the path of that circuit renews the one way valve.
Incidentally, this is why diodes have orientation