Battery draining fast

Good Morning,

I'm beginning to think the wiring in this car has been seriously messed with. Yes, as Redfish said the regulator needs to be grounded well to the firewall. The original mounting screws are self tapping types that over the years don't tighten very well after being removed and replaced several times. So, carefully clean the firewall mounting area of rust and old paint and also clean the regulator mounting bracket of rust and paint. Use an actual nuts, bolts and lock washers if you can get behind the firewall.

Please take some photos of that #8 wire you mentioned so we can see what you have there. Also, post some photos of the starter relay on the firewall and bulk head connector area so we can get an idea of how bad the wiring has been messed with.

You now have a new regulator and alternator and it still isn't charging so, I have to believe that it's a wiring issue. Also, let us know about the 12 volts on the blue regulator wire.

With your new alternator, put your voltmeter across your battery, disconnect the green wire to the alternator field, start the car and very briefly connect the alternator field terminal to the alternator output stud with a short jumper wire . The voltmeter should jump up to 16 to 17 volts. This will confirm the alternator is good and it is connected to the battery through the charging circuit. Do this test quickly and do not leave the field connected to the output stud for longer than it takes to get a voltmeter reading. Let us know what you find.