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Old 12-14-2011, 12:31 AM   #5300 (permalink)
MPaulHolmes
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Michael's Electric Beetle - '71 Volkswagen Superbeetle 500000
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I think I heard Tesseract say that you need a diode across even the ev200 with the economizer. I'm not sure, as I've never used an oscilloscope on it after turnoff, but it might not be a bad idea.

Pin 4 of U9 should go to zero volts (close anyway) to turn on Q1. Pin 3 should be stuck at 0 volts all the time. Pin one should be 5v all the time. When the contactor is OFF, Pin 2 should be 5v. When the contactor is ON, pin 2 should be 0 volts.
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