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Polar Express 1225 E-Unit Oddity...

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  • Member since
    November 2011
  • 247 posts
Posted by M. Mitchell Marmel on Friday, August 14, 2015 7:02 PM

lionelsoni

If that were the only problem, I agree.

In any case, there are only yellow and blue wires to the motor, which are the typical colors--no red.

Well, yes. 

Plus to minus...minus to plus...

And lo, the Berkshire is now buzzing happily around, sending out smoke signals and cheerfully whistling! 

 Mitch

  • Member since
    December 2001
  • From: Austin, TX
  • 10,096 posts
Posted by lionelsoni on Friday, August 14, 2015 3:45 PM

If that were the only problem, I agree.

In any case, there are only yellow and blue wires to the motor, which are the typical colors--no red.

Bob Nelson

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    August 2004
  • 815 posts
Posted by EIS2 on Friday, August 14, 2015 1:53 PM

Since, the motor defaults to reverse, it is likely that you have the power wires reversed.

  • Member since
    November 2011
  • 247 posts
Posted by M. Mitchell Marmel on Friday, August 14, 2015 12:10 PM

Nope.  It's been suggested on the O Gauge forums that I installed the motor backwards, which is a possibility:

Note the red dot; two bits says that side should be connected to the red wire...Mitch

  • Member since
    December 2001
  • From: Austin, TX
  • 10,096 posts
Posted by lionelsoni on Friday, August 14, 2015 11:52 AM

Did you disconnect any wires other than the two to the (I assume, permanent-magnet) motor?

Bob Nelson

  • Member since
    November 2011
  • 247 posts
Polar Express 1225 E-Unit Oddity...
Posted by M. Mitchell Marmel on Friday, August 14, 2015 9:24 AM

Since I replaced the motor and traction tires on my 1225, the E-unit has begun behaving oddly:

1) It defaults to reverse when at rest for a few moments.

2) When the whistle switch is pushed, all power to the motor is cut until the switch is released.  It does this with or without the tender. 

Any ideas?

Mitch

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