You do not say where the engine is when you flip the points. Is it on the oval, or is it in the siding?.
If you have a short as Mike says, your prodigy green lights on the controller will be flashing alternately, and you may also hear a buzzing as the fan comes on. ( I have a Prodigy)
If the engine is on the oval, does it start off again when you flip the points back?
I use Lenz Silver decoders, as I find them very reliable and resistant to problems.
Alan
If you have a short as Mike says, your prodigy green lights on the controller will be flashing alternately, and you may also hear a buzzing as the fan comes on. ( I have a Prodigy)
If the engine is on the oval, does it start off again when you flip the points back?
I use Lenz Silver decoders, as I find them very reliable and resistant to problems.
Alan