Help!!

I have a short in my 2-10-0...I had to replace the board and I'm quite sure I put it back in correctly...The black wire went to the lead truck, the red to the back. Neither truck connection is touching the tender weight. The large connection to the loco is on the left the small on the right. Looking at the front of the tender. The insulated wheel sets are on the left, again looking at the front of the tender....This new board was purchased from Bachmann. The loco was not altered in any way..I'm REALLY confused....


Thanks, Steve