PS-2 Wiring Diagram

You could use the wiring chart in the PS2 upgrade manual for the engines basic wiring.

You really need to go by the new decoder's diagram as that will determine what goes where. I don't think you even need to look at the MTH diagram?

Physically tracing wires inside the engine is best. Some steam wiring is limited by the tether.

Obviously, being a PS2 engine (and when it was produced?), there are probably light bulbs in most places that run on 6 volts. Just the markers are LEDs.

So you may have to change them, or set the new decoder to the correct output voltage (resistors needed?).

I would swap everything to LEDs at this time and add resistors where needed.

She has a wireless drawbar which makes some of the tracing a little ridiculous.  I will use the upgrade kit as a diagram if it is pretty standard to what was put into the actual production models.  Thanks Joe!

In my experience, over the years MTH wiring changed. That's why it is recommended not to swap out tenders!

So unless you get the exact wiring for that model in that year, I still recommend tracing any wire before connecting. I realize that tethers add to the issue. I had an engine that had the wiring run thru a tether, and a tether adapter, confusing the heck out of me. When I used a meter, I got false responses because of the board was still connected. The wiring uses some wires for double duty.

If you can't physically trace a wire fully, use a meter but make sure the wire is disconnected at both ends first.

I don't believe that wiring diagrams are available for each model to regular users? An email to a tech might be in order if you run into a specific problem.

Good deal, WM Russian Decapod is about to invade my pike!