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If you have the power trucks, it's a simple swap-in affair.  For enhanced operation and to run all 4 motors from one reverse unit, wire the motors in each A unit in series, and then the two A units in parallel. The load on the reverse unit will be about the same as a single factory wired 2 motor A unit and the set won't run at rocket-like speeds at 6 volts.

Being of limited expertise when it comes to circuit boards, my only concern here, is that the 4 motored K-Line Alco FA's came with a larger and more robust circuit board than did all the other models that had only 2 motors. I doubt K-Line would have used a more costly circuit board unless they found it was needed. I can remember from my original K-Line parts listing that there were 2 differing circuit boards for the Alco FA's and one of those was specified as for 4 motored units.

From what I am gathering from Rob's information (my interpretation) he is saying this would only work - that is using the smaller circuit board from the dual motored engines - if you wire all the motors  in series.

All I know is all of the dual powered double A-A K-Line Alco FA units I've ever bought all came with the larger, more robust circuit board, connected via a tether that connected via a mounted plug adapter in the rear door way of the lead Alco. Later versions of these engines also came equipped with a slide switch beneath the engine so you could select between series or parallel wiring.

...the 4 motored K-Line Alco FA's came with a larger and more robust circuit board than did all the other models that had only 2 motors...

...this would only work - that is using the smaller circuit board from the dual motored engines - if you wire all the motors  in series.

Ohm's Law. The load on the reverse unit will be about the same as a single factory wired 2 motor A unit and the set won't run at rocket-like speeds at 6 volts when each unit has series-wired motors.

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