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 Step 1 - Removing the Wiring Harness on Older Atlas/Kato Models
For the Atlas GP7, remove the plastic handrails on each side of the loco.  Gently insert an X-Acto knife under each stanchion and pull the tab from the shell or from the frame.  If you don't remove the handrails, you will melt them with your soldering iron - guaranteed!. 
The locomotive shell is held to the chassis by two snap-tabs on each side of the cab and by a tab at the long-nose end of the shell.  If you turn your loco over, you can see the end of this tab.  To remove the shell, grasp the cab with your hand, gently push the shell forward and, at the same time, lift up on the cab.  The cab should pop out of the chassis.  There is no need to use force or a crowbar! 
 In removing the wiring harness, there is no need to cut any wires or saw through any plastic.  If you do, you may damage important parts! 
The first step is to remove the bare copper wires from the grey plastic platform.
  • Select one of the bare copper wires which run down the length of the grey plastic platform.  There is a bend in the middle of each of the bare copper wires. 
  • Insert an X-acto knife under the bend  and raise the bend in the wire.  Grasp the raised part of the wire with your fingers.
  • Each wire is held in place by 4 plastic tabs.  Place the dull side of the X-acto knife against the bare copper wire next to one of the plastic tabs closest to the middle of the plastic platform.  Press the wire towards the middle of the platform.  The wire should slip out of the plastic tab. 
  • Place the dull side of the X-acto knife against the wire next to the plastic tab at the end of the plastic platform. Press the wire away from the middle of the platform.  The wire should slip out of the plastic tab. 
  • Repeat the process for the same wire at the other end of the plastic platform - the middle tab first, the end tab second.  The bare copper wire should be completely free of the grey plastic platform. 
  • The two black wires at each end of the plastic platform can be removed from the bare copper wire, simply by sliding each black wire off the end of the bare copper wire.  Discard the bare copper wire.  It will not be reused.  Bend the black wires at each end of the grey plastic platform away from the platform.  These wires will be reused, so treat them carefully. 
  • Repeat the above steps for the second bare copper wire. 

The second step is to release the two copper strips that are on each side of the motor and bent over the grey plastic platform. 
  • Insert an X-acto knife under one of the copper strips and bend it up. 
  • Use a pair of needle-nose pliers to bend the copper strip so that it is completely vertical. 
  • Repeat the process for the second copper strip. 

The third step is to release the grey plastic platform from the black plastic tabs at each end of the motor mechanism. Do not use force.  They will snap off! 
  • Slide the dull back edge of an X-acto knife under one end of the grey plastic platform until it touches the black plastic tab. 
  • Gently press the X-acto knife against the top edge of the tab. 
  • At the same time, gently pry up the grey plastic platform with your fingers. 
  • You want to press in the plastic tab no more than 1/16 of an inch. 
  • As you press in with the X-acto knife and pry up with your fingers, the grey plastic platform will release from the tab. 
  • Slide the grey plastic platform off the other tab and set it aside. It will not be reused. 

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