SUCCESS !
The adjustable voltage regulator arrived the other day along with the pigtail.
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Maybe they include the pigtail to allow owners of the 1969 and earlier cars the ease of installation?
The box had no instructions inside, just what you see here.
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Instructions were not necessary though. It has a slotted button on the back.
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Hard to screw that up, right?
Before all of this, the other alternator and regulator had the car idling at around 14 volts with no lights or heater-A/C fan going. With those on, the volts dropped to 10-11. That is what motivated me to make changes.
The Tuff Stuff alternator and regulator helped a lot but went too far. I was at 15+ volts. I tried 2 other regulators and got the same reading. The wiring was good, everything is well grounded so I figured that this regulator would fix the issue.
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Fast idle but that is where it likes to be.
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The volts are where they need to be now too. At first, it was charging at 15 volts! I turned the button CCW and it went
up to 16. Turning it clockwise brought it down to a slightly wavering 13.8 to 14.0. With the headlights on at idle, it drops to 13. A/C and lights drops only a little more. This will have to do. I tested at the terminals on the battery that is in the trunk.
I’d rather err on the side of caution rather than cook the battery and have to spring for another one.
Score !