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The lights in my bathroom and bedroom go dim then back to normal. its been going on now for three days. Its not happening in any other room of the house. What could be the problem?
 

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Likely a loose wire connection somewhere in the circuit.
If you aren't comfortable with electricity I'd hire an electrician to check it out and repair.
To DIY, you'd have to check the wiring and connections from the breaker box to each fixture/outlet, switch, junction box(es) to find the loose/broken connection. Entering the breaker box is the most dangerous place to work.
 

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Bill Kearney
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What Bob said. But what kinds of lights are in the room? Is there a dimmer? Could be the switch or lights need replacing. Start with something simple, pull the bulbs and try them in another room/fixture. If new bulbs do the same thing then it's likely the switch or wiring.
 

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UAW SKILLED TRADES
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Likely a loose wire connection somewhere in the circuit.
If you aren't comfortable with electricity I'd hire an electrician to check it out and repair.
To DIY, you'd have to check the wiring and connections from the breaker box to each fixture/outlet, switch, junction box(es) to find the loose/broken connection. Entering the breaker box is the most dangerous place to work.
Agreed .. probably a neutral wire at a backstabed connection on a receptacle but you never know what may end up as the cause.
 
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Master Electrician
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could be a motor kicking on that wasn't running before as well. Maybe a new window ac installed? shouldn't be on a shared circuit with the bath but hey WAY stranger things have happened.
 
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What these answers have in common is that the resistance in the line is too high for the load on it. Another possibility is that an appliance is failing and so drawing excessive current.

Between a good or bad appliance and good or bad connections there are three ways to cause your problem. Complicating this is that a bad wirenut may show 0.05 ohm but this much resistance is perfectly normal for 10' of Romex.

To weed out which of these three possibilities is causing your problem, we need to know how many feet of what gauge Romex made of copper or aluminum runs back to your panel.
 

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Just in those two rooms? With the record heat we have in the midwest/Great Lakes region, the electric company can't keep up with demand. We have had a lot of dimming lights the last few days.
 
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