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Neutral Safety Switch Signal to Engage Alternator
I'm using a signal from my neutral safety switch(Park-Neutral-Position Indicator) to open a relay that kicks on my alternator. I've got an automatic transmission, so when i'm coasting, braking or stopped i have my car in neutral and my alternator is charging my battery(deep cycle battery in trunk). I've also got a switch/led indicator on my dash so i can have the alternator running all the time(if driving at night), and i monitor my battery/alternator output with a cigarette lighter voltmeter. My commute every day is only 26 miles round trip and my battery seems to be handling the load...Battery is recharged every night.
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