1988 Toyota Pickup cold start system

Cold start system does not work. I have changed c/s inj. Time switch, coolant temp. Sensor (2 wire next to c/s inj. Time switch ) connector on c/s inj. Time switch was broken, so got new connector cap, but wires may have been installed backwards. When key is turned to start, 4volts in black / white striped wire. When cold (at 35 degrees) when hot, 12 volts at b/w wire when b/w wire @ c/s injector is grounded to battery. C/s injector works when wire with 12 volts is connected, & ignition switch is activated.