LW Trans needs service help.

Check the reverse button that the contacts have not been reversed.

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Chuck,

I just checked. No wire on the "U" terminal.

There is just a metal spring type tab that is touching the metal housing/cover. Pressing the "Direction" button breaks this contact.

Hmmm..... Well the next possible problem source is the whistle control switch. Check for loose, disconnected wires. Check that the leaf springs that sits on the contacts is nice and firm against the rivet heads. You may need to remove the metal frame if you can't see, get to the contacts. Check that the contacts on the binding posts A-U are all tight.

Yes, if "U"(center rail connection) is not getting any voltage, the reverse button or the whistle control is not passing current. Remember too that the two "A" posts are common on this model.

Zak, from what you describe:
"I now get voltage at terminals, A-C = 14.6v / A-B = 19.6v"
> A to C and A to B = you are seeing voltage across the XFMR windings only.
"Light in handle goes from off to bright!"
> Assuming this is only at full throttle, this would occur because the lamp is connected to A and connects to B at full throttle. (The current path for the lamp does not go through the Whistle Control or Direction Control.)

>> Check the wiper of the Variable Control Throttle, it is probably not contacting the XFMR windings.
>> If you find and solve the problem there, so that the lamp operates over the full range, but the variable track voltage is still not available at U, then follow Chuck and Rob's advice above.

Dave