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Wisconsin | Always start with charged batteries, then if they sit overnight, even ten minutes, and they're still 12.5+V and they start the engine, then they're good enough to test the alternator. BUT I don't think bad batteries is your most likely issue. Use a multimeter to test the voltage from the alternator B+ to the positive post on the battery while running, then the alternator case to the negative battery post. If you use a Powerprobe, hook the clamps to the ALTERNATOR, because they won't read NEGATIVE voltage.
You may have blown a fusible link, the ground is not likely the problem because the starter takes way more amps than the alternator puts out, so it wouldn't start if that was the issue, but then you may have a ground directly on the starter but not alternator, so test and find out. The jumpers will work fine also if that makes more sense to you. | |
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Voltage ?
