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I have a 1990 Volvo 240DL with 220,000 miles on it. The alternator and battery are brand new and have both been tested as good. Car starts up and stays running but isn’t getting a good voltage at the battery. It’s reading roughly 12 volts after start up. The alternator doesn’t start to charge the battery until it’s been at WOT for about a second and once I’ve done that the volt meter reads roughly 14 volts at idle with no loads and with loads it’s reading roughly 13 volts. I’m wondering if it has something to do with the excite wire as I’ve heard that could be the issue. But I can’t exactly trace the connections as it’s unclear as to how the path goes because the wiring goes in to a protective tubing and joins with other wires at a certain point. I would use a wiring diagram but I don’t understand them and it doesn’t tell me what the path is anyway.
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