I have this PS1 SD90MAC (20-2184-1) and it runs like a rocket at 9 volts. How do I wire the motors in series so it'll slow down. I have an PS1 F3 set (20-2176-1) that I'd like to slow down too.
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Wiring motors in series:
The motors have two wires attached to them. They could be any two colors, but for purposes of this discussion, we will assume that each motor has one white wire and one yellow wire, OK?
-take off the shell
-Follow the white wire from one motor back to the board and snip that wire at the board.
-follow the yellow wire from the other motor back to the board and snip it off at the board.
-now you have one motor with a long unattached white wire, one motor with a long unattached yellow wire and two wire stubs on the board.
-take the long unattached white wire from one motor and connect it to the long yellow wire from the other motor. You can connect them with wire nuts, or solder and heat shrink.
-put some tape or heat shrink on the stubs of wire on the boards if they can touch anything.
-test drive the loco before putting the shell back on.
That's all there is to it. Your loco will run more slowly and be less inclined to slow down in spots where the track voltage is low.
There are other ways to do it, some that are more easily reversible, but this is the quickest/easiest way.
Here is how to do it do so you can switch between series & parallel. A DPDT switch is used.
Thanks Roy. I'll get on it.
