1994 Isuzu Truck Cam Gear Timing Mark 1200 O Clock Crank Also Distrib Set 1 Gets

The cam gear timing mark is at 1200 o clock and the crank gear timing mark is also at 1200 o clock and the distrib is set at 1 o clock and it gets no response-- however I did try setting the distrib on # 4 and still got no response any suggestions