I replaced my fuel level sender unit in the gas tank since I thought it was bad due to the low fuel light being on all the time. Well, evidently that wasn't the problem since the light is still staying on. The wiring diagram shows one wire from the low level sender in the tank to the bulb in the dash. If it were broken the light wouldn't come on, and if it were shorted, it'd blow a fuse, no? The ground wire must be ok since the light is on. Any ideas?