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This is illogical as inside the C7042 there are relays that join the two tracks together for digital mode. I would suspect that the continuity of connection close to the powerbase in lane 2 is not good.
The best test (most sensitive) is to use your ear. Run a car at max speed but holding its wheels in the air. Is the note/frequency the same in lane 1 and 2 directly on the powerbase? If not then there is a hardware fault in the powerbase. If it isthe same then slowly move the car over each joint listening to hear a drop in note. When you identify a change attack the joint with a flat blade screwdriver to make the connection more solid.
 

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Its really not sensitive enough. The voltage across the rails will float up to the same level as the powerbase. Using a volt meter takes very very little current so it will see full voltage. When a car is involved it takes real current, when the current is being drawn through a bad joint (high resistance) then the voltage will depress and you can get a difference. But your brain and ear can hear very tiny differences in frequency. I have always used this technique to identify where the volts are lost, it works with analogue or digital.
 
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