https://blog.model-train-help.com/2021/11/parts-for-marklin-67014-z-scale-power-pack.html?utm_source=rss&utm_medium=rss&utm_campaign=parts-for-marklin-67014-z-scale-power-pack Model railroads and model trains Mon, 20 Dec 2021 23:35:22 +0000 hourly 1 https://wordpress.org/?v=6.9.4 https://blog.model-train-help.com/2021/11/parts-for-marklin-67014-z-scale-power-pack.html#comment-55839 Mon, 20 Dec 2021 23:35:22 +0000 http://blog.model-train-help.com/?p=6275#comment-55839 Most likely the potentiometer has a fixed center tap. The power supply plus is on one end of the potentiometer and the minus is on the other end.
The wiper at the center position is over the center tap and no power flows to the engine. Turning left or right provides power to the engine.

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