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It is a large body 1G for sure. It will be 70-100amps, decent bottom end output. May have been built bigger than that though as it is in a chrome case. Could be a real pos too. 3G would be a nice upgrade.
3,4, and 6G should use an LED. Or can use anyway. An LED and pigtail is like $5 from NAPA. Just power has to come from a keyed source, so that it turns on and off with the key.
I dont recall seeing fusible links in production vehicles until at least the 80's. They are a cheap way of fusing a system, and definitely not something to be considered the best way. As Steve mentioned, a mega fuse is a far better choice. Though personally, I would never fuse the alternator...
Very good point, and when this happens you will damage the alternator. Though it is not the way it is wired stock, you should have a wire going directly from the alternator's output post to the positive on the battery. On a stock alternator, you can do this with a 10ga wire and be overkill.
I think the amp meter is picking up magnet fields, but I could be wrong. A leaking diode, noise suppressor is more cutting off the spikes in the AC generated in the stator windings, and turning into DC so it can be stored in the battery, or used while the vehicle is running.
Clean your grounds until it is 0.2 volts on the multimeter for grounds, and 0.3 for positive runs. Industry stanard is 0.5 total.
Make sure the yellow wire has full battery voltage too, it is needed to charge.
Do you have a spare known good battery you could put in there just for fun? Your sympthoms could be caused by a bad battery, and it will always check out fine with most tests. Without some really great test equipment and knowledge, the easiest test is to just replace the battery with a good one...