Reply to "MTH PS2 allegheny schematic wire harness pcb w/2diodes"

Thanks for answering my question  But I am confused. The 2  diodes w/ the cathodes (stripes) are on the left side  looking from the rear of the engine looking toward the front.There are 2 pins at each end.  The pins on the anode end don't seen to have any connection to to a trace,unless it was cut off, Shouldn't there be one, The pins on the  cathodes end have the two purple wires and the two pins soldered together. I get nothing. no chuff or headlight The engines runs I get start up sounds, fan works smoke elements get hot  But no chuff.   Do the purple wires power the chuff & headlight?  And is there a connection that I'm missing.