this morning all of the lights were burning dim, I went to turn on a heater and the intensity of other lights changed. I shut off all of the breakers, turned on one at a time. Problem moved to different areas as I turned different areas on. Seems that when lights are dim and I switch on a breaker from the opposite side everything gets brighter. I can't seem to isolate the problem. When I plug in a heater somewhere else, the lights burn bright again, but the heater won't run. help
You've got a loose neutral somewhere. This is very serious, and you should turn off your main breaker until it is fixed, as you are getting higher than normal voltage in some areas, and lower voltage in others. It can cook your electronics and appliances.
Call the power company, and get them to come out and check their connections. Often the problem is at the service entrance.