Do not connect both throttles to one track circuit. It is not necessary, you will not be able to control your trains properly, and you will not get any more power that way. Any multi-throttle transformer, like KW, ZW, Z4000 etc. can output its' maximum power through any one throttle. All you need to do is load it down with trains, lights, accessories, etc.
Many hobbyists unfortunately think a transformer can "put out" a certain wattage. A transformer has the capacity to provide a certain wattage, but it may NOT provide that wattage when running trains if there is not enough of a load to provide that wattage. A transformer rated at 200 watts hooked up to a layout with only a 15 watt bulb connected will only provide 15 watts, because that is all the layout is asking for.
The rated output of your Z400 can go through either throttle.
Larry
Wrong in the case of the Z4000. You can get a maximum of 180 watts from each output, a UL maximum. Also, you can't connect the inputs together to try to get more power from a single connection, from the user's manual.
Note: The owner should not, at any time, attempt to connect or short any of the voltage outputs together in an effort to gain more power output. If the user attempts such a procedure, the Z-4000 may become permanently disabled. At the very least, the Z-4000 will automatically shut down and the red OVERLOAD light will be illuminated.
The new, computer controlled transformers are indeed limited to the total amount amount of power available at each throttle, due presumably to UL regulations so that we do not "hurt" ourselves. The older transformers do not have that limitation.
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