Posted by MarkB_MI on August 02, 2014 at 14:47:04 from (70.194.10.127):
In Reply to: Lights dim then bright posted by John in La on August 02, 2014 at 07:25:14:
When lights dim, you are getting voltage drop. Where that voltage drop is, you'll have to find for yourself. It might be in the neutral, but it could just as easily be on the hot side. Or both. A voltmeter will tell the true story. It the voltage is fluctating on all circuits in the house, you have a problem with your electrical main. If it's isolated to a single circuit, then the problem is on that circuit.
In older houses, it is real common to have utility room outlets tied into other circuits, even lighting circuits. A real common source of problems are backwired outlets, where the electrician just pushed wires into the holes in the back of the receptacles rather than using the screws. These start to fail after about 20 years.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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