Reply to "Problems with my K-Line MP-15 Diesel Engine"

I'm also experiencing this issue with my K-Line MP-15.

Engine details:

- Union Pacific, #1506

- K-2200-8 stamped on the bottom.

- Only one switch on the bottom. Has no labeling, but I assume it's for direction lock as opposed to series vs parallel. Switch position seems to have no effect on getting this thing to go forward.

I tried the test with connecting a 9V battery to each motor, and each moves forward, or in reverse when the wires are swapped (and both get powered on and move at the same time with this battery test, btw).

My question is, before I consider replacing the whole e-unit, would disconnecting the two white wires for the direction lock switch be a valid troubleshooting test, in case it's bad? Can this particular engine run fine in forward/neutral/reverse without it being connected?

Otherwise, I'm not seeing components that look burnt, nor do I see any loose connections at solder points, or anything that looks like it might be shorting concern.

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