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I came across an idea sometime ago that will help prevent making wiring mistakes. It's just a simple audio continuity tester. You need a [url="http://www.allelectronics.com/cgi-bin/category.cgi?category=115&item=PZB-25&type=store"]piezo element[/url], a [url="http://www.allelectronics.com/cgi-bin/category.cgi?category=970&item=BST-71&type=store"]9 volt battery holder[/url], [url="http://www.allelectronics.com/cgi-bin/category.cgi?category=160600&item=PRC-1604&type=store"]9 volt battery[/url], a pair of [url="http://www.allelectronics.com/cgi-bin/category.cgi?category=search&item=ALG-17&type=store"]insulated alligator clips[/url] and some wire. Make a simple circuit by connecting one wire from the battery holder to the piezo element, the other wire from the battery holder to an alligator clip. Connect a wire to the other terminal of the piezo and a alligator clip on the other end. Connect the battery and test the circuit by touching the clips together. Now connect the clips to the bus wire to the track terminals. As you are laying track and feeder wires, If you connect the wrong wires or have a short, the buzzer will sound. Having an alarm sound the instant you make a mistake is better than trying to find a short when your finished.
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