1033 Transformer Problem

[gottcent]

I bought a Lionel 1033 transformer at a train show recently. When I tested it with my voltmeter, it behaved flawlessly. But as soon as I hooked it up to a load, the variable voltage output between the U and A terminals dropped to zero. (Constant voltage between A and B and between B and C continued to operate.) I immediately hooked up another transformer to the same load and it worked fine, so I know there's no short or other problem with the load itself. What would cause this? I'm wondering if there could be a problem with the circuit breaker that only appears during load conditions. Any advice will be appreciated.

John

[BigAl 956]

I concur, it's possibly a bad circuit breaker. What is the load? Perhaps the load is too much for the old breaker?

[lionelsoni]

If the voltage between the B and C terminals remains normal (about 11 volts) under load, the problem is not with the circuit breaker, which is in series between the B and C terminals.  I would look for a high-resistance connection in the path from the wiper, through the 5-volt whistle winding, the whistle-control switch, and out to the U terminal. 

[gottcent]

Thanks, guys. I'll recheck the voltage readings and try your suggestions. BTW--the load was a Lionel 50 gang car and a postwar Erie "hobo and cop" operating gondola.

John