Sometimes folks complain of erratic horn operation on dual motor Williams. I found this when pulling light loads as well. They think it's the loco or transformer.
However the problem is too low a track voltage to trigger the horn properly. The rewire makes the loco need higher volts to run the same speed. That is why it cures the horn issues at low speeds or light loads. At the same time the headlight is brighter & looks better.
Very best, Don Johnson
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