Re: amp meter reads discharge
If the alternator is of the original design of being externally regulated, this is normal operation as the alt is not reg'd enough during idle to supply the current needed, the battery supplies what the alt can't. This leads to the 12 VDC reading at the battery posts with all accessories on at idle rpm.
Ammeter is hooked up correctly, abeit, the wire on the battery post should be on the junction block next to the battery. Rev up the engine/alt, voltage should rise. As said, normal operation for the original equipment installed at the factory when car was made.
You can simply do one of two things; 1) install an electronic voltage regulator, Wells P/N VR715, plug & play, 2) disconnect the ext regulator, and to the connector removed, jumper the two inside terminals and jumper the two outside terminals, and get a jumper connector from 10DN to a 10SI/12SI alt, and install the same 10SI/12SI alt. Either one of these two changes will improve the electrical system. But, with all accessories on, you would still only get 13 VDC at battery at idle. As accessories are turned off, voltage comes up.
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