Adding Light switch, Polyfuses and Inductors:

The MTH Passenger cars I purchased (American Freedom and Daylight) were first production runs and did not come with on/off switches for the lights as later runs did.  Since I prefer to have the lights off during the day I decided to add a light switch to each car and also add resettable polyfuses to protect from accidental shorts that might occur. (see http://www.rayman4449.com/Aristocraft_Heavyweight_Polyfuse.htm for more info)  In my case I also added inductors to the pos and neg wires to eliminate the reductions in track signal on my digital control system.


To start, I removed the top of the car by removing the screws holding it down. (accessed through the bottom)  I then cut the pos and neg wires that run to the power transfer post that provides power to the roof wiring.  At the end of each of these four wires (that run to the trucks) I added a single polyfuse to protect against shorts. 

Source for the fuses:  http://www.allelectronics.com/make-a-store/item/RXE-065/RESETTABLE-CIRCUIT-PROTECTOR-0.65-1.3-AMP/-/1.html

From there, I then added the selected the switch and added two inductors (Choke Coils), one to each center post.  (This is where the power wires will be run to the overhead lights)  (I added heat shrink to the inductors.)  The wires with the poly fuses are added to one side of the switch terminals.  (two per terminal - two left rail pickup wires on one terminal and two right rail pickup wires on the other. 


Next, I selected where I wanted the switch to be but still fit the switch with inductors and polyfuses.  The formed tank on the bottom of the car worked perfectly.  I drilled out a slot for the switch head and the screws. 

When you're finished this is what it should look like.


Instructions for Observation Cars:

The first run observation cars did already come with light switches.  The only thing I wanted to add was inductors and polyfuses to protect against shorts. 

The voltage control board is located in the rounded bar area.  Once you remove the floor you can get access to it.

The red and black wires that run to the left bottom side of the board are the power feeder wires to the board.  I removed the wires from the board and added one inductor to each location in the board.  I then added two polyfuses per wire end (only one each are pictured) and wired the other end of the polyfuse to the inductor.  I then reinstalled the board and reassembled the car.



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