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Well, I put the controller together again and checked the voltage from the gate resistors to B-, and it rose from zero up to about 12 volts before dropping back to zero as the LED started flashing. Connected a 12 volt lamp to M- and M+B+(with a second 12 volt battery) and it went brighter as I turned the 5K pot.
I will try it in the car again tomorrow and see what happens.
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