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Wiring question about 1033 transformer

Hi. I have a post war 1033 transformer on the layout exclusively powering about 24 light bulbs for buildings and one operating Oil Derick. I have the U for ground and A for the power. I noticed that after about 20 minutes, the top of the 1033 is very warm, especially the B post. Is that normal? Everything seems to be working fine, but I'm just concerned that I may have a short somewhere under the board. I ran a ground wire and a power wire under the entire layout. Do all the bulb wires have to match grounds and power wires? I'm thinking I may have some of the lights grounded to the U post and some to the A post. That has to be the problem.  Duh, Thanks

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OGR Publishing, Inc., 1310 Eastside Centre Ct, Suite 6, Mountain Home, AR 72653
330-757-3020

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