http://ivestrains.org/CD/wiring/Ogauge.jpg
Just skip the reverse unit though. Power comes in thru the pickup plate and goes to the headlight and one of the brushes. Then from the other brush to the field armatuer, then grounded to the sideframes of the motor in order to to to the outside rails of the track thru the wheels.
Be sure that none of the metal part of the wiring is touching any parts of the motor. Also make sure your headlight connection is not shorting out by touching metal. In other words, all connections need to be capped with a screw cap or be wrapped in electrical tape or covered with insulation. Anywhere the wiring is exposed and is touching other metal, it can short.
If wiring is good, you may try replacing the brushes.
Ives locomotives are great at actually catching on fire with orig. wiring...so you may just want to redo all the wiring.
