"Bad neutral" is the correct diagnosis, but obviously your electricians were unable to track it down.
Here's what was happening: The lights were on one leg, and the 120 volt outlets were on the other. If everything is wired properly, there should almost no voltage drop, so the neutral stays at about zero volts referenced to ground. But if there's a bad connection, you'll have voltage drop, and voltage drop can occur in either the hot or cold wires (or both). So, for the purposes of discussion, let's assume your lighting circuits have a five volt drop in the neutral. Now if you add a heavy load on the opposite leg, that will cause the neutral voltage to swing to that leg. So now, maybe the voltage drop in the neutral is five volts, but 180 degrees out of phase with the lighting circuits. five plus five is ten, so the voltage across the lighting circuits increased by a whopping ten volts when you started the motor.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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