Well, the guys at supramania.com suggested I run a voltage drop test. I did, and wound up with a 1.0V drop between the alternator and the battery. So, I'm tracking that down now. I found a bunch of issues, like a big drop across the fusible link, so I replaced it. Then, the connector from the fuse block the the battery was frayed, so I trimmed the wire and put on a fresh connector. I'm at 0.65V now. Also, the alternator voltage bothered me, so I took it for a bench-test. It failed, so now I have a replacement alternator, thanks to a lifetime warranty. I hope I can track down the rest of this voltage drop. Thanks for your advise, tho. Even with the voltage drop at idle, the battery was suffering from lack of charging power at running speed that wasn't allowing the battery to fully charge at all. That lead to the dimming lights that was bugging me at stop lights.
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