If it passes those tests, then it would be time to move on to the secondary outputs. If you are -still- seeing 0 ohms, then the transformer is shot and worthless (unless you want to salvage the wire or the core for some reason, which isn't easy no matter how you look at it) throw it away. However, if you do measure 0 ohms, then cut the cord off (ideally, if you can desolder it from the transformer, this is best), and remeasure the resistance at the transformer. If it seems ok (that is, if you measure a resistance, rather than 0 ohms, which is what a dead-short would look like - measure it at the plug, then measure again at the transformer itself, if possible), then that wasn't the issue. So - assuming the transformer is good, do you intend to replace the primary cable (that is, the dual-conductor cable that plugs into the wall)? Is that the part you suspect has a short? Have you tested it for a short with your DVM? That should be your first task. I'd rather not hook it up to the wall outlet though, because the alarm clock was broken and I suspect it was a short in the cable I would have to use to plug it in.
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