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I went and bought a volt meter that plugs into the cigarette lighter port. I've been driving the car for several days now with my switch to ground. The battery is now showing only 12.2 volts.
I started the car and it was at about 12.3 volts while running and no extra load.
I then shut the car off and unplugged the 4 pin connector from the alternator. Started the car again, and it was showing only 11.6 volts.
Looks like my easy method doesn't disable the alternator, just puts it into low charge mode. The results aren't all bad, considering I saw a 3-4% gain on the highway while still charging. i wonder what it would be with the alternator completely disabled.
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