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The two outputs leave PCB05 (bottom board the motor connects to inside the boiler) and go to PCB02 (top board inside the boiler) on blue and orange wires.

You can cut the blue and orange wires near the plug on PCB05 and connect the reed switch to the wires feeding the top board.

Inside the tender you will find these two wires on opposite ends of JP1 Remove JP1 to gain access to whatever you connect to the blue and orange in the boiler.
 

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(1 and 2) Remove two screws under the cab

(3) Pull off the front dome and remove the single screw under it

(4) Remove the small screw in the reversing linkage. Where? Reach inside th cab, lift up on that big lever where the engineers right hand is, and you can move the lever forward and back. the lever extends through the cab floor. follow the moving part forward along the right side of the loco to about the middle of the loco. There, you will find a tiny screw loosely attaching it to a lever that moves some of the valve mechanism. That's the screw.

Those are the four screws Bachmann says to remove. I STRONGLY advise you to remove 4 more.
(5 through 8) Remove the four screws that hold the two boiler braces. These are the two rods that connect the front of the smoke box to the cow catcher. Then rotate the two rods upward and pull them out of the sides of the smoke box.

Finally, remove the front of the smoke box, not just the door on the smoke box front, but the entire plate the door hinges on. Look inside and notice that there is a LARGE LIP on the cross-head then protrudes forward and holds the smoke box down.

Now, working from the rear, lift up on the cab and rotate the cab and boiler assembly about 20 degrees, then slide the cab and boiler forward to disengage the LARGE LIP from the inside of the smoke box rear.

When reassembling, the hardest part is getting the large lip engaged up and over the bottom rear edge of the smoke box. While you don't need to remove the smoke box front to take the loco apart, you will need to remove it to put it back together. (Just ask Tony) I recommend removing the front and looking at the large lip prior to removing the boiler, just so you will know what you need to accomplish when putting the loco back together.

Believe it or not, It only takes a minute or two to remove or install the boiler.
 
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