Crank Position Sensor~IF BAD,will it keep motor from getting fuel??? on 1996 Dodge Ram Van 3500

Have replaced Pump,CHECKED RELAYS ETC.I jiggled wires to CKP sensor,they seemed rather noodly at the top,turned key and vehicle started,but wouldnt stay nothing. I took out sensor,wiped it of(had oil on it) ,..put it back and my TAILLIGHTS stay on.Anyone know does this indicate a BAD sensor??And why would my taillights stay on??Disconnected battery to not run down battery??

Asked by for the 1996 Dodge Ram Van 3500