1033 transformer question

[northernpike]

I have a question for the  1033 experts.  I soldered on a new cord on an old 1033 that was given to me.  The voltage drops out as I increase the black throttle voltage.  What would cause this.

THanks

[Deggesty]

You might want to send this question to one of the model trains forums or to the classic toy train forum. You can find them all at http://cs.trains.com/forums/