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The garage door opener does work but when I plugged in a light on the same wall outlet, it blow up the bulb and there was a lighting arc coming out and blacked the wall outlet plastic cover. That was why I thought there was a short circuit there - but it could be a temporary surge, and I don't...

I have a Genie 2027 garage door opener, and when measuring its power plug by a multimeter, it shows a resistance of ~6 ohm with connectivity. Is this normal? Is there a short circuit of some sort in there? The reason I began to measure is the wall outlet smoked up once when plugging the power...