2002 caravan.No start after blower motor,blower motor resister and heater controler replacement.

Hi.I replaced all three of the above components on my wifes van,and then when I went to restart it, it would crank but not start. I can hear the fuel pump coming on when I turn the key,and I checked for spark on one wire yesterday and it was fine. I don't understand,the van was running fine when I pulled it into the garage.Battery is strong.