crossover problem

[rtb]

I have a NS EZ-track DC remote right hand crossover and the engine stops at the frog.  I think we have a short in the crossover. I have five others and they work fine.  Is there a chance I have connected the green wires wrong.  On the bottom of the crossover it talks about flipping the green wire, but I am not sure I understand if this is necessary since I believe the instructions say it doesn't matter if the frog is metal.

Thanks
Ron