Looking to replace the rectifier disk in a SW whistle control that is no longer working. I have done this in others but this one is being a bit of a challenge. I have tried 2 differant diodes that I normally use. They are the most common ones everyone uses. however heres the problem that I have not run into before. If I use the original mounting bracket in the system I get no power loss but I also get no whistle. Bypass the bracket I get a whistle but my voltage drops from 19 down to 7-9volt and the train will come to just about a complete stop. I have not come across this problem before. I have tried various diodes and ways to hook the system up and get the same result. Even using multible engines and tender that I know function as they should.
I would greatly appreciate some assistance on this problem.
Are you using a stud rectifier? I've always used a 1N1184R or similar device. The frame of the bracket is typically the anode of the rectifier but on some Lionel transformers they reverse the whistle polarity. I don't think reverse polarity makes a difference with postwar trains. Perhaps the mechanical connection between the mounting bracket and the transformer is corroded or a wire came loose? Just guessing here. Let us know how you make out.
Got it fixed and working great. The problem was with the whistle switch its self. Found some fragments that were causing a short when used. Had to put on the magnifying glasses to see it.
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