So this engine has always run good until I installed some switches and no a problem has been exposed it wont cross them it looses power. Upon inspection with my meter I discover the rear drive wheels are not Grounded to the Green middle wire on the motor like the front wheels are. I suspect that's the problem. Where do look to uncover a damaged wire or bracket? Start by taking the truck apart? Also (separate issue) the front roller has always sparked a lot I mean excessive. but it spins freely and shows no signs of wearing uneven. What can be done with it? TMCC model train with Magnatraction and pullmor motor 1997 model I believe. thanks Jeff
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