@JFC454 posted:You might try this to see if the problem is with the transformer. With the ZWL power OFF, change the switches on the back to Run, Conventional (not Command) and 4C. The power must be off before the switches are set. THEN turn on the power. Move the throttle handle on the ZWL for just A to 18 volts and leave the other handles at 0 volts. Using your meter measure the voltage across the A-U and D-U terminals on the back of the transformer. If both A-U and D-U read 18 volts with only 1 throttle set there is probably an issue with the ZWL. If everything checks out OK try setting throttle D to 18 volts with A set at 0 and measure the voltages at the transformer terminals. If everything looks normal repeat the test but measure the voltages on the two loops to see if only one loop is powered when only one throttle is set to 18 volts.
Here's what I did:
1. set ZW to conventional and all A-D power to 0
2.Powered up A to 18v. D read 15+ despite the handle set to 0
3. Reversed 2 above. D to 18V. A read 16+ despite being set to 0
4. I set all handles to 0. Powered up A to 18v. Both loops registered about 16+ volts.
If the ZW-L has a problem, I still don't understand how I get continuity/ohms registering between the outside and middle rails on two loops. The third loop, isolated from the problem 2 tests correctly. The continuity reading between the loops happens even when I physically detach the power leads to the loops.
