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You don't mention the year of your 240 but please consider the possibility (probability) that you have the dreaded disintigrating wire harness syndrome. My 1980 needed alternator repairs and maybe a new battery (I replaced it) but it also had the wiring harness problem. It got to the point where the the car would start fine and go about a half block before dying, even with a fully charged battery. It also began to frequently have the starter staying engaged (even with the ignition turned off it kept running). It's the main engine harness starting at the gray connector at the firewall and routing to all the electric components on the engine, mostly routed under the intake manifold. I'm one of the lucky ones who finally realized that I had more than a charging system problem. The correct fix is replacing the harness, I went for cheap and repaired. Every wire in the harness needed at least partial replacement. Most of the dammage was inside the bundle jacket under the intake manifold. Many people report finding disintigrating insulation at the connector, mine was fine there.
Anyway, even if your alternator and/or battery prove to be defective, you may find the symptoms don't go away. By the way, in my case repairing the previously rebuilt alternator didn't pan out as the rear frame was worn out, allowing the shaft vibrate things apart. Doing well now with a $35 alternator from a wrecking yard.
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