I have 1044 transformer where the whistle rectifier disc get very hot and burns out even with just the transformer plugged in and not at load. U post is to common rail and "A" post to center rail. All internal wiring seems intact with no sign of burning or shorting. The discs I am using were previously removed from a ZW. Any suggrstions will be appreciated.
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The whistle diode is only in the circuit when the whistle switch is closed.
Since Olson's website went down, a lot of broken links back to them on this topic across forums.
Regardless, your first problem is what is wrong with your whistle switch before blaming it on the diode.
Second part is, why is there is a short circuit through the whistle diode basically between the U terminal and one of the other posts or windings- again, something very badly wrong with your whistle switch mechanism.
After i made the post I went back and took another look and it appears the return spring is weak as the whistle knob seems to bind and does not always return to open after the whistle is sounded. I guess I need to replace the spring which I hope is not too dificult to do. Any suggestions on that procedure?
A related problem topic- this time with drawings in that topic. Specifically dealing with the parts and diagram of the 1044 whistle control lever system.
U post is to common rail and "A" post to center rail...
Per postwar convention(all single train transformers), on the 1044 "A" post goes to common rail and "U" post to center rail. The whistle circuit(and direction) are on the "U" post circuit. If you reverse it, you are mistakenly sending DC to all accessories you have connected to the "U" as common in error.
Multi-train/throttle transformers use "U" as the common, to the outside rails.