1984 S15 Sierra Classic no start
My 1984 Seirra Classic had been giving me a bit of trouble starting. It will crank but no start. The starter wires had got damaged when I replaced exhaust and were not moved away enough. I fixed 2 different breaks in them but I drove it home unloaded it.cut it off the crank it. Moved it to parking spot. Went inside slept got up at 4am it crank but would not start. I checked wires on starter, battery and charge. I just started fooling with this truck in August, fuel pump was lose and no battery when purchased. Put new battery, distributor and rotar, spark plug wires, spark plugs, vacuum lines and fuel filter. Air filter and radiator hose. Slowly trying to replace disengrating part due to age. I am leaning toward it being wires that I have repaired but it doesn’t quite seem same. I am thinking crankshaft sensor. It cranks about half way, then grinding and acts like not enough power. Suggestions or answers appreciated