Last year, I upgraded to a Lionel GW-180 transformer for my Christmas Tree layout. I had previously used a BW-80 for 14 years, but it failed on me. Anyway, everything lights up properly when I turn on the transformer, but if I increase the throttle to a certain point, the lights on my buildings all go dim. I noticed it last year, but some of my terminals were not getting power as well, so I assumed I had a short somewhere. I ran down all of the wiring after Christmas, and tightened up some bad connections. Forgot all about it, until I hooked it up last night. The layout is only 6x6, and there are less than a dozen buildings on it right now. They are all wired to barrier strips, which are connected to the accessories terminal on the GW. I understand my accessories output is adjustable, but from what I read the default is a constant 12v. Why would it go down when I hit the throttle? By the way, the train does not seem affected by this problem, it runs just fine no matter how much throttle I give it. I admit I am no electrical engineer, but since the layout itself has never been changed, and only the transformer is different, I can't figure out what is happening. Nothing in the owner's manual addresses this specific topic. Anybody have a guess?
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What type of train are you running? Multiple engines with 2 PulMor motors and lighted cars?
It seems like you are approaching an 8 amp draw. 12 buildings with incandescent lights and a train as described above can pull a lot of amps.
Harbor Freight has an inexpensive clamp meter that you can use to measure the current.
Absent that, disconnect one wire on half of the buildings and observe. If no dimming, add back one building at time until you observe it.
You have twice as much power available with the 180 compared to the BW, so you shouldn't run out. But, it is all shared whether it's on the ACC or the A/U.
It actually did it when there was no train on there, then again when I put a Lionel GP-38 on the track.
I couldn't imagine an overload, as I ran the same buildings with a smaller power supply. Also, it does not affect the train.
Sounds like a wiring issue. Did you jumper the terminals on the barrier strips to make multi-position hot (A) and (U)common?
Also, I would not think that the track U and ACC U is tied together in this type of controller. I'll check out it later as I have one.
Moonman posted:...Also, I would not think that the track U and ACC U is tied together in this type of controller...
They are common to each other.
Scrambler81 posted:It actually did it when there was no train on there, then again when I put a Lionel GP-38 on the track.
Does dimming occur at the same throttle position with and without train present?
Does dimming occur if you disconnect the track wires/cables right at the controller (to take track wiring out of the equation)?
It does seem to happen at the same throttle position. I will try disconnecting the track when I get home.