Need to fix AC power to Ademco Vista alarm system


Old 08-18-12, 01:01 PM
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Need to fix AC power to Ademco Vista alarm system

Recently my kid unplugged our AC transformer for our alarm system out of the receptacle in the wall, and as a result the weight of the transformer snapped the red, black, green, and yellow wires that attached to the positive (+) and negative (-) screws away. And yes I know the AC transformer should have been screwed to the receptacle in hind sight. Anyway, as a result I put the red and black wire behind the (+) screw and the green and yellow wire behind the (-) screw. Then I plugged it in and NO POWER. So, then I went to the central alarm box and saw that the 4 wires going into the box showed that the red and yellow wires were under the postive (+) screw and the black and green wires were under the negative (-) screw. After seeing that I went back to the transformer and matched it to the way it was in the alarm box putting the red and yellow to the (+) screw on transformer and the black and green to the (-) screw on the transformer. Then plugged in the AC transformer with again NO POWER. My question is: Did I happen to blow the AC Transformer by having the wrong wire colors together under the postive and negative screws and I need to buy a new AC Transformer? If not, What could be the problem with not getting power back? I tested my receptacle and it shows that it is fine.
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Old 08-18-12, 02:48 PM
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Welcome to the forums! You probably did no damage to the transformer itself, but you may have blown an internal fuse in the alarm system. If you remove the cover you may find a small fuse that has turned black. Test your transformer with your meter and see if it's output is as stated on the wart itself.
Old 08-18-12, 05:39 PM
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Actually, you may very well have "smoked" the transformer. Alarm system transformers often have an internal, non-replaceable, fuse. When you miswired the cable you ended up with a direct short circuit across the transformer secondary.

Try removing all the wires from the transformer and then checking it for power output.

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