To control a latching relay with only 1 wire, use a dual coil relay. Hook one end of one coil directly to 12 volts. Hook one end of the other coil directly to ground. Connect the other ends of both coils through your 1 wire to the center pole of a double throw, momentary contact switch. Connect the other two poles to 12 volts and ground, respectively. Push the switch one way and the relay latches in the on position. Push the switch the other way and the relay latches in the off position. When the switch is pressed the wrong way, nothing happens except a tiny bit of power is wasted.
Eric Thompson S/V Procrastinator South San Francisco [EMAIL PROTECTED]
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